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Finding the Fourth Proportional to 100,505.78, 138,693.30 and 60,241.76

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Solution

The fourth proportional to 100,505.78, 138,693.30 and 60,241.76 is: 83,130.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,505.78 : 138,693.30 = 60,241.76 : x
  2. Step 2: Convert to fraction form
    100,505.78/138,693.30 = 60,241.76/x
  3. Step 3: Cross multiply
    100,505.78x = 138,693.30 × 60,241.76
  4. Step 4: Simplify right side
    100,505.78x = 8,355,128,492.21
  5. Step 5: Solve for x
    x = 8,355,128,492.21/100,505.78
  6. Step 6: Final answer
    x = 83,130.83

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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.