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Finding the Fourth Proportional to 115,155.69, 172,700.73 and 72,972.11

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Solution

The fourth proportional to 115,155.69, 172,700.73 and 72,972.11 is: 109,437.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,155.69 : 172,700.73 = 72,972.11 : x
  2. Step 2: Convert to fraction form
    115,155.69/172,700.73 = 72,972.11/x
  3. Step 3: Cross multiply
    115,155.69x = 172,700.73 × 72,972.11
  4. Step 4: Simplify right side
    115,155.69x = 12,602,335,803.14
  5. Step 5: Solve for x
    x = 12,602,335,803.14/115,155.69
  6. Step 6: Final answer
    x = 109,437.37

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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.