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Finding the Fourth Proportional to 99,071.76, 136,719 and 56,631.20

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Solution

The fourth proportional to 99,071.76, 136,719 and 56,631.20 is: 78,151.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,071.76 : 136,719 = 56,631.20 : x
  2. Step 2: Convert to fraction form
    99,071.76/136,719 = 56,631.20/x
  3. Step 3: Cross multiply
    99,071.76x = 136,719 × 56,631.20
  4. Step 4: Simplify right side
    99,071.76x = 7,742,561,032.80
  5. Step 5: Solve for x
    x = 7,742,561,032.80/99,071.76
  6. Step 6: Final answer
    x = 78,151.04

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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.