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Finding the Fourth Proportional to 100,932.78, 139,172.48 and 64,585.76

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Solution

The fourth proportional to 100,932.78, 139,172.48 and 64,585.76 is: 89,054.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,932.78 : 139,172.48 = 64,585.76 : x
  2. Step 2: Convert to fraction form
    100,932.78/139,172.48 = 64,585.76/x
  3. Step 3: Cross multiply
    100,932.78x = 139,172.48 × 64,585.76
  4. Step 4: Simplify right side
    100,932.78x = 8,988,559,615.29
  5. Step 5: Solve for x
    x = 8,988,559,615.29/100,932.78
  6. Step 6: Final answer
    x = 89,054.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.