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Finding the Fourth Proportional to 615,281.40, 921,366.90 and 490,865.40

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Solution

The fourth proportional to 615,281.40, 921,366.90 and 490,865.40 is: 735,057.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,281.40 : 921,366.90 = 490,865.40 : x
  2. Step 2: Convert to fraction form
    615,281.40/921,366.90 = 490,865.40/x
  3. Step 3: Cross multiply
    615,281.40x = 921,366.90 × 490,865.40
  4. Step 4: Simplify right side
    615,281.40x = 452,267,131,915.26
  5. Step 5: Solve for x
    x = 452,267,131,915.26/615,281.40
  6. Step 6: Final answer
    x = 735,057.38

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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.