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Finding the Fourth Proportional to 100,420.30, 138,568.30 and 60,128.47

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Solution

The fourth proportional to 100,420.30, 138,568.30 and 60,128.47 is: 82,970.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,420.30 : 138,568.30 = 60,128.47 : x
  2. Step 2: Convert to fraction form
    100,420.30/138,568.30 = 60,128.47/x
  3. Step 3: Cross multiply
    100,420.30x = 138,568.30 × 60,128.47
  4. Step 4: Simplify right side
    100,420.30x = 8,331,899,869.50
  5. Step 5: Solve for x
    x = 8,331,899,869.50/100,420.30
  6. Step 6: Final answer
    x = 82,970.27

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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.