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Finding the Fourth Proportional to 100,635.18, 138,889.68 and 64,929.06

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Solution

The fourth proportional to 100,635.18, 138,889.68 and 64,929.06 is: 89,610.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,635.18 : 138,889.68 = 64,929.06 : x
  2. Step 2: Convert to fraction form
    100,635.18/138,889.68 = 64,929.06/x
  3. Step 3: Cross multiply
    100,635.18x = 138,889.68 × 64,929.06
  4. Step 4: Simplify right side
    100,635.18x = 9,017,976,366.10
  5. Step 5: Solve for x
    x = 9,017,976,366.10/100,635.18
  6. Step 6: Final answer
    x = 89,610.58

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1.5x scale

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.