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Finding the Fourth Proportional to 90,920.56, 125,509.20 and 61,129.84

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Solution

The fourth proportional to 90,920.56, 125,509.20 and 61,129.84 is: 84,385.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,920.56 : 125,509.20 = 61,129.84 : x
  2. Step 2: Convert to fraction form
    90,920.56/125,509.20 = 61,129.84/x
  3. Step 3: Cross multiply
    90,920.56x = 125,509.20 × 61,129.84
  4. Step 4: Simplify right side
    90,920.56x = 7,672,357,314.53
  5. Step 5: Solve for x
    x = 7,672,357,314.53/90,920.56
  6. Step 6: Final answer
    x = 84,385.28

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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.