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Finding the Fourth Proportional to 99,082.05, 136,728.90 and 56,643.31

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Solution

The fourth proportional to 99,082.05, 136,728.90 and 56,643.31 is: 78,165.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,082.05 : 136,728.90 = 56,643.31 : x
  2. Step 2: Convert to fraction form
    99,082.05/136,728.90 = 56,643.31/x
  3. Step 3: Cross multiply
    99,082.05x = 136,728.90 × 56,643.31
  4. Step 4: Simplify right side
    99,082.05x = 7,744,777,468.66
  5. Step 5: Solve for x
    x = 7,744,777,468.66/99,082.05
  6. Step 6: Final answer
    x = 78,165.29

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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.