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Finding the Fourth Proportional to 90,721.20, 127,140.90 and 90,721.20

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Solution

The fourth proportional to 90,721.20, 127,140.90 and 90,721.20 is: 127,140.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,721.20 : 127,140.90 = 90,721.20 : x
  2. Step 2: Convert to fraction form
    90,721.20/127,140.90 = 90,721.20/x
  3. Step 3: Cross multiply
    90,721.20x = 127,140.90 × 90,721.20
  4. Step 4: Simplify right side
    90,721.20x = 11,534,375,017.08
  5. Step 5: Solve for x
    x = 11,534,375,017.08/90,721.20
  6. Step 6: Final answer
    x = 127,140.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.