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Finding the Fourth Proportional to 100,663.25, 138,911.75 and 55,340.90

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Solution

The fourth proportional to 100,663.25, 138,911.75 and 55,340.90 is: 76,368.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,663.25 : 138,911.75 = 55,340.90 : x
  2. Step 2: Convert to fraction form
    100,663.25/138,911.75 = 55,340.90/x
  3. Step 3: Cross multiply
    100,663.25x = 138,911.75 × 55,340.90
  4. Step 4: Simplify right side
    100,663.25x = 7,687,500,988.87
  5. Step 5: Solve for x
    x = 7,687,500,988.87/100,663.25
  6. Step 6: Final answer
    x = 76,368.50

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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.