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Finding the Fourth Proportional to 813,381.40, 1,220,072.10 and 393,477.40

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Solution

The fourth proportional to 813,381.40, 1,220,072.10 and 393,477.40 is: 590,216.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    813,381.40 : 1,220,072.10 = 393,477.40 : x
  2. Step 2: Convert to fraction form
    813,381.40/1,220,072.10 = 393,477.40/x
  3. Step 3: Cross multiply
    813,381.40x = 1,220,072.10 × 393,477.40
  4. Step 4: Simplify right side
    813,381.40x = 480,070,797,720.54
  5. Step 5: Solve for x
    x = 480,070,797,720.54/813,381.40
  6. Step 6: Final answer
    x = 590,216.10

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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.