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Finding the Fourth Proportional to 515,281.70, 721,885.90 and 515,281.70

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Solution

The fourth proportional to 515,281.70, 721,885.90 and 515,281.70 is: 721,885.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,281.70 : 721,885.90 = 515,281.70 : x
  2. Step 2: Convert to fraction form
    515,281.70/721,885.90 = 515,281.70/x
  3. Step 3: Cross multiply
    515,281.70x = 721,885.90 × 515,281.70
  4. Step 4: Simplify right side
    515,281.70x = 371,974,593,758.03
  5. Step 5: Solve for x
    x = 371,974,593,758.03/515,281.70
  6. Step 6: Final answer
    x = 721,885.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.