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Finding the Fourth Proportional to 72,428.90, 108,643.35 and 60,764.90

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Solution

The fourth proportional to 72,428.90, 108,643.35 and 60,764.90 is: 91,147.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,428.90 : 108,643.35 = 60,764.90 : x
  2. Step 2: Convert to fraction form
    72,428.90/108,643.35 = 60,764.90/x
  3. Step 3: Cross multiply
    72,428.90x = 108,643.35 × 60,764.90
  4. Step 4: Simplify right side
    72,428.90x = 6,601,702,298.42
  5. Step 5: Solve for x
    x = 6,601,702,298.42/72,428.90
  6. Step 6: Final answer
    x = 91,147.35

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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.