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Finding the Fourth Proportional to 911,125.40, 1,366,688.10 and 412,489.40

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Solution

The fourth proportional to 911,125.40, 1,366,688.10 and 412,489.40 is: 618,734.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    911,125.40 : 1,366,688.10 = 412,489.40 : x
  2. Step 2: Convert to fraction form
    911,125.40/1,366,688.10 = 412,489.40/x
  3. Step 3: Cross multiply
    911,125.40x = 1,366,688.10 × 412,489.40
  4. Step 4: Simplify right side
    911,125.40x = 563,744,354,356.14
  5. Step 5: Solve for x
    x = 563,744,354,356.14/911,125.40
  6. Step 6: Final answer
    x = 618,734.10

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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.