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Finding the Fourth Proportional to 99,128.68, 148,840.63 and 40,079.68

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Solution

The fourth proportional to 99,128.68, 148,840.63 and 40,079.68 is: 60,179.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,128.68 : 148,840.63 = 40,079.68 : x
  2. Step 2: Convert to fraction form
    99,128.68/148,840.63 = 40,079.68/x
  3. Step 3: Cross multiply
    99,128.68x = 148,840.63 × 40,079.68
  4. Step 4: Simplify right side
    99,128.68x = 5,965,484,821.40
  5. Step 5: Solve for x
    x = 5,965,484,821.40/99,128.68
  6. Step 6: Final answer
    x = 60,179.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.