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Finding the Fourth Proportional to 72,291.52, 108,420.54 and 19,690.48

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Solution

The fourth proportional to 72,291.52, 108,420.54 and 19,690.48 is: 29,531.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,291.52 : 108,420.54 = 19,690.48 : x
  2. Step 2: Convert to fraction form
    72,291.52/108,420.54 = 19,690.48/x
  3. Step 3: Cross multiply
    72,291.52x = 108,420.54 × 19,690.48
  4. Step 4: Simplify right side
    72,291.52x = 2,134,852,474.46
  5. Step 5: Solve for x
    x = 2,134,852,474.46/72,291.52
  6. Step 6: Final answer
    x = 29,531.16

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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.