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Finding the Fourth Proportional to 128,862.70, 178,000.86 and 107,422.48

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Solution

The fourth proportional to 128,862.70, 178,000.86 and 107,422.48 is: 148,385.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,862.70 : 178,000.86 = 107,422.48 : x
  2. Step 2: Convert to fraction form
    128,862.70/178,000.86 = 107,422.48/x
  3. Step 3: Cross multiply
    128,862.70x = 178,000.86 × 107,422.48
  4. Step 4: Simplify right side
    128,862.70x = 19,121,293,823.33
  5. Step 5: Solve for x
    x = 19,121,293,823.33/128,862.70
  6. Step 6: Final answer
    x = 148,385.02

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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.