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Finding the Fourth Proportional to 813,689.80, 1,220,534.70 and 222,713.80

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Solution

The fourth proportional to 813,689.80, 1,220,534.70 and 222,713.80 is: 334,070.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    813,689.80 : 1,220,534.70 = 222,713.80 : x
  2. Step 2: Convert to fraction form
    813,689.80/1,220,534.70 = 222,713.80/x
  3. Step 3: Cross multiply
    813,689.80x = 1,220,534.70 × 222,713.80
  4. Step 4: Simplify right side
    813,689.80x = 271,829,921,068.86
  5. Step 5: Solve for x
    x = 271,829,921,068.86/813,689.80
  6. Step 6: Final answer
    x = 334,070.70

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.