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Finding the Fourth Proportional to 615,215.80, 921,959.70 and 489,071.80

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Solution

The fourth proportional to 615,215.80, 921,959.70 and 489,071.80 is: 732,920.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,215.80 : 921,959.70 = 489,071.80 : x
  2. Step 2: Convert to fraction form
    615,215.80/921,959.70 = 489,071.80/x
  3. Step 3: Cross multiply
    615,215.80x = 921,959.70 × 489,071.80
  4. Step 4: Simplify right side
    615,215.80x = 450,904,490,006.46
  5. Step 5: Solve for x
    x = 450,904,490,006.46/615,215.80
  6. Step 6: Final answer
    x = 732,920.85

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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.