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Finding the Fourth Proportional to 285,999.90, 428,999.85 and 72,767.40

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Solution

The fourth proportional to 285,999.90, 428,999.85 and 72,767.40 is: 109,151.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,999.90 : 428,999.85 = 72,767.40 : x
  2. Step 2: Convert to fraction form
    285,999.90/428,999.85 = 72,767.40/x
  3. Step 3: Cross multiply
    285,999.90x = 428,999.85 × 72,767.40
  4. Step 4: Simplify right side
    285,999.90x = 31,217,203,684.89
  5. Step 5: Solve for x
    x = 31,217,203,684.89/285,999.90
  6. Step 6: Final answer
    x = 109,151.10

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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.