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Finding the Fourth Proportional to 91,215.99, 125,808.77 and 78,490.49

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Solution

The fourth proportional to 91,215.99, 125,808.77 and 78,490.49 is: 108,257.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,215.99 : 125,808.77 = 78,490.49 : x
  2. Step 2: Convert to fraction form
    91,215.99/125,808.77 = 78,490.49/x
  3. Step 3: Cross multiply
    91,215.99x = 125,808.77 × 78,490.49
  4. Step 4: Simplify right side
    91,215.99x = 9,874,791,570.78
  5. Step 5: Solve for x
    x = 9,874,791,570.78/91,215.99
  6. Step 6: Final answer
    x = 108,257.24

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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.