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Finding the Fourth Proportional to 90,615.30, 125,062.74 and 65,205.78

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Solution

The fourth proportional to 90,615.30, 125,062.74 and 65,205.78 is: 89,993.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,615.30 : 125,062.74 = 65,205.78 : x
  2. Step 2: Convert to fraction form
    90,615.30/125,062.74 = 65,205.78/x
  3. Step 3: Cross multiply
    90,615.30x = 125,062.74 × 65,205.78
  4. Step 4: Simplify right side
    90,615.30x = 8,154,813,510.64
  5. Step 5: Solve for x
    x = 8,154,813,510.64/90,615.30
  6. Step 6: Final answer
    x = 89,993.78

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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.