Home / 645,008.06-890,121.76-354,631.88

Finding the Fourth Proportional to 645,008.06, 890,121.76 and 354,631.88

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Solution

The fourth proportional to 645,008.06, 890,121.76 and 354,631.88 is: 489,397.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,008.06 : 890,121.76 = 354,631.88 : x
  2. Step 2: Convert to fraction form
    645,008.06/890,121.76 = 354,631.88/x
  3. Step 3: Cross multiply
    645,008.06x = 890,121.76 × 354,631.88
  4. Step 4: Simplify right side
    645,008.06x = 315,665,553,177.71
  5. Step 5: Solve for x
    x = 315,665,553,177.71/645,008.06
  6. Step 6: Final answer
    x = 489,397.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.