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Finding the Fourth Proportional to 128,291.76, 177,022.80 and 71,692.20

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Solution

The fourth proportional to 128,291.76, 177,022.80 and 71,692.20 is: 98,924.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,291.76 : 177,022.80 = 71,692.20 : x
  2. Step 2: Convert to fraction form
    128,291.76/177,022.80 = 71,692.20/x
  3. Step 3: Cross multiply
    128,291.76x = 177,022.80 × 71,692.20
  4. Step 4: Simplify right side
    128,291.76x = 12,691,153,982.16
  5. Step 5: Solve for x
    x = 12,691,153,982.16/128,291.76
  6. Step 6: Final answer
    x = 98,924.16

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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.