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Finding the Fourth Proportional to 115,424.47, 159,288.47 and 72,405.79

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Solution

The fourth proportional to 115,424.47, 159,288.47 and 72,405.79 is: 99,921.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,424.47 : 159,288.47 = 72,405.79 : x
  2. Step 2: Convert to fraction form
    115,424.47/159,288.47 = 72,405.79/x
  3. Step 3: Cross multiply
    115,424.47x = 159,288.47 × 72,405.79
  4. Step 4: Simplify right side
    115,424.47x = 11,533,406,747.99
  5. Step 5: Solve for x
    x = 11,533,406,747.99/115,424.47
  6. Step 6: Final answer
    x = 99,921.68

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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.