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Finding the Fourth Proportional to 77,630.40, 107,069.28 and 65,726.40

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Solution

The fourth proportional to 77,630.40, 107,069.28 and 65,726.40 is: 90,651.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,630.40 : 107,069.28 = 65,726.40 : x
  2. Step 2: Convert to fraction form
    77,630.40/107,069.28 = 65,726.40/x
  3. Step 3: Cross multiply
    77,630.40x = 107,069.28 × 65,726.40
  4. Step 4: Simplify right side
    77,630.40x = 7,037,278,324.99
  5. Step 5: Solve for x
    x = 7,037,278,324.99/77,630.40
  6. Step 6: Final answer
    x = 90,651.06

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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.