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Finding the Fourth Proportional to 642,700.80, 964,051.20 and 476,812.80

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Solution

The fourth proportional to 642,700.80, 964,051.20 and 476,812.80 is: 715,219.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,700.80 : 964,051.20 = 476,812.80 : x
  2. Step 2: Convert to fraction form
    642,700.80/964,051.20 = 476,812.80/x
  3. Step 3: Cross multiply
    642,700.80x = 964,051.20 × 476,812.80
  4. Step 4: Simplify right side
    642,700.80x = 459,671,952,015.36
  5. Step 5: Solve for x
    x = 459,671,952,015.36/642,700.80
  6. Step 6: Final answer
    x = 715,219.20

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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.