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Finding the Fourth Proportional to 115,438.40, 173,287.20 and 89,259.20

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Solution

The fourth proportional to 115,438.40, 173,287.20 and 89,259.20 is: 133,989.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,438.40 : 173,287.20 = 89,259.20 : x
  2. Step 2: Convert to fraction form
    115,438.40/173,287.20 = 89,259.20/x
  3. Step 3: Cross multiply
    115,438.40x = 173,287.20 × 89,259.20
  4. Step 4: Simplify right side
    115,438.40x = 15,467,476,842.24
  5. Step 5: Solve for x
    x = 15,467,476,842.24/115,438.40
  6. Step 6: Final answer
    x = 133,989.01

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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.