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Finding the Fourth Proportional to 99,630.78, 138,433.96 and 98,590.74

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Solution

The fourth proportional to 99,630.78, 138,433.96 and 98,590.74 is: 136,988.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,630.78 : 138,433.96 = 98,590.74 : x
  2. Step 2: Convert to fraction form
    99,630.78/138,433.96 = 98,590.74/x
  3. Step 3: Cross multiply
    99,630.78x = 138,433.96 × 98,590.74
  4. Step 4: Simplify right side
    99,630.78x = 13,648,306,557.53
  5. Step 5: Solve for x
    x = 13,648,306,557.53/99,630.78
  6. Step 6: Final answer
    x = 136,988.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.