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Finding the Fourth Proportional to 915,690, 1,263,730.12 and 513,359.76

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Solution

The fourth proportional to 915,690, 1,263,730.12 and 513,359.76 is: 708,480.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    915,690 : 1,263,730.12 = 513,359.76 : x
  2. Step 2: Convert to fraction form
    915,690/1,263,730.12 = 513,359.76/x
  3. Step 3: Cross multiply
    915,690x = 1,263,730.12 × 513,359.76
  4. Step 4: Simplify right side
    915,690x = 648,748,191,107.97
  5. Step 5: Solve for x
    x = 648,748,191,107.97/915,690
  6. Step 6: Final answer
    x = 708,480.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.