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Finding the Fourth Proportional to 615,214.80, 921,958.20 and 489,070.80

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Solution

The fourth proportional to 615,214.80, 921,958.20 and 489,070.80 is: 732,919.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,214.80 : 921,958.20 = 489,070.80 : x
  2. Step 2: Convert to fraction form
    615,214.80/921,958.20 = 489,070.80/x
  3. Step 3: Cross multiply
    615,214.80x = 921,958.20 × 489,070.80
  4. Step 4: Simplify right side
    615,214.80x = 450,902,834,440.56
  5. Step 5: Solve for x
    x = 450,902,834,440.56/615,214.80
  6. Step 6: Final answer
    x = 732,919.36

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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.