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Finding the Fourth Proportional to 515,280.70, 721,884.50 and 515,280.70

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Solution

The fourth proportional to 515,280.70, 721,884.50 and 515,280.70 is: 721,884.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,280.70 : 721,884.50 = 515,280.70 : x
  2. Step 2: Convert to fraction form
    515,280.70/721,884.50 = 515,280.70/x
  3. Step 3: Cross multiply
    515,280.70x = 721,884.50 × 515,280.70
  4. Step 4: Simplify right side
    515,280.70x = 371,973,150,479.15
  5. Step 5: Solve for x
    x = 371,973,150,479.15/515,280.70
  6. Step 6: Final answer
    x = 721,884.50

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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.