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Finding the Fourth Proportional to 100,675.48, 138,939.40 and 60,390.94

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Solution

The fourth proportional to 100,675.48, 138,939.40 and 60,390.94 is: 83,343.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,675.48 : 138,939.40 = 60,390.94 : x
  2. Step 2: Convert to fraction form
    100,675.48/138,939.40 = 60,390.94/x
  3. Step 3: Cross multiply
    100,675.48x = 138,939.40 × 60,390.94
  4. Step 4: Simplify right side
    100,675.48x = 8,390,680,969.04
  5. Step 5: Solve for x
    x = 8,390,680,969.04/100,675.48
  6. Step 6: Final answer
    x = 83,343.84

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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.