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Finding the Fourth Proportional to 128,138.47, 176,830.44 and 71,549.86

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Solution

The fourth proportional to 128,138.47, 176,830.44 and 71,549.86 is: 98,738.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,138.47 : 176,830.44 = 71,549.86 : x
  2. Step 2: Convert to fraction form
    128,138.47/176,830.44 = 71,549.86/x
  3. Step 3: Cross multiply
    128,138.47x = 176,830.44 × 71,549.86
  4. Step 4: Simplify right side
    128,138.47x = 12,652,193,225.74
  5. Step 5: Solve for x
    x = 12,652,193,225.74/128,138.47
  6. Step 6: Final answer
    x = 98,738.44

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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.