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Finding the Fourth Proportional to 101,149.92, 139,652.64 and 90,521.28

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Solution

The fourth proportional to 101,149.92, 139,652.64 and 90,521.28 is: 124,978.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,149.92 : 139,652.64 = 90,521.28 : x
  2. Step 2: Convert to fraction form
    101,149.92/139,652.64 = 90,521.28/x
  3. Step 3: Cross multiply
    101,149.92x = 139,652.64 × 90,521.28
  4. Step 4: Simplify right side
    101,149.92x = 12,641,535,728.18
  5. Step 5: Solve for x
    x = 12,641,535,728.18/101,149.92
  6. Step 6: Final answer
    x = 124,978.21

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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.