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Finding the Fourth Proportional to 72,302.40, 108,388.80 and 64,429.20

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Solution

The fourth proportional to 72,302.40, 108,388.80 and 64,429.20 is: 96,586.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,302.40 : 108,388.80 = 64,429.20 : x
  2. Step 2: Convert to fraction form
    72,302.40/108,388.80 = 64,429.20/x
  3. Step 3: Cross multiply
    72,302.40x = 108,388.80 × 64,429.20
  4. Step 4: Simplify right side
    72,302.40x = 6,983,403,672.96
  5. Step 5: Solve for x
    x = 6,983,403,672.96/72,302.40
  6. Step 6: Final answer
    x = 96,586.06

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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.