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Finding the Fourth Proportional to 90,653.88, 124,658.70 and 78,696.30

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Solution

The fourth proportional to 90,653.88, 124,658.70 and 78,696.30 is: 108,215.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,653.88 : 124,658.70 = 78,696.30 : x
  2. Step 2: Convert to fraction form
    90,653.88/124,658.70 = 78,696.30/x
  3. Step 3: Cross multiply
    90,653.88x = 124,658.70 × 78,696.30
  4. Step 4: Simplify right side
    90,653.88x = 9,810,178,452.81
  5. Step 5: Solve for x
    x = 9,810,178,452.81/90,653.88
  6. Step 6: Final answer
    x = 108,215.76

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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.