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Finding the Fourth Proportional to 615,234.30, 921,987.45 and 489,090.30

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Solution

The fourth proportional to 615,234.30, 921,987.45 and 489,090.30 is: 732,948.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,234.30 : 921,987.45 = 489,090.30 : x
  2. Step 2: Convert to fraction form
    615,234.30/921,987.45 = 489,090.30/x
  3. Step 3: Cross multiply
    615,234.30x = 921,987.45 × 489,090.30
  4. Step 4: Simplify right side
    615,234.30x = 450,935,118,516.74
  5. Step 5: Solve for x
    x = 450,935,118,516.74/615,234.30
  6. Step 6: Final answer
    x = 732,948.60

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1.5x scale

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.