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Finding the Fourth Proportional to 86,781.40, 130,172.10 and 80,949.40

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Solution

The fourth proportional to 86,781.40, 130,172.10 and 80,949.40 is: 121,424.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,781.40 : 130,172.10 = 80,949.40 : x
  2. Step 2: Convert to fraction form
    86,781.40/130,172.10 = 80,949.40/x
  3. Step 3: Cross multiply
    86,781.40x = 130,172.10 × 80,949.40
  4. Step 4: Simplify right side
    86,781.40x = 10,537,353,391.74
  5. Step 5: Solve for x
    x = 10,537,353,391.74/86,781.40
  6. Step 6: Final answer
    x = 121,424.10

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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.