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Finding the Fourth Proportional to 115,900.40, 173,980.20 and 89,721.20

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Solution

The fourth proportional to 115,900.40, 173,980.20 and 89,721.20 is: 134,682.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,900.40 : 173,980.20 = 89,721.20 : x
  2. Step 2: Convert to fraction form
    115,900.40/173,980.20 = 89,721.20/x
  3. Step 3: Cross multiply
    115,900.40x = 173,980.20 × 89,721.20
  4. Step 4: Simplify right side
    115,900.40x = 15,609,712,320.24
  5. Step 5: Solve for x
    x = 15,609,712,320.24/115,900.40
  6. Step 6: Final answer
    x = 134,682.13

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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.