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Finding the Fourth Proportional to 115,398.81, 172,642.93 and 87,399.81

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Solution

The fourth proportional to 115,398.81, 172,642.93 and 87,399.81 is: 130,754.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,398.81 : 172,642.93 = 87,399.81 : x
  2. Step 2: Convert to fraction form
    115,398.81/172,642.93 = 87,399.81/x
  3. Step 3: Cross multiply
    115,398.81x = 172,642.93 × 87,399.81
  4. Step 4: Simplify right side
    115,398.81x = 15,088,959,061.34
  5. Step 5: Solve for x
    x = 15,088,959,061.34/115,398.81
  6. Step 6: Final answer
    x = 130,754.89

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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.