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Finding the Fourth Proportional to 90,859.81, 125,380.29 and 56,866.87

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Solution

The fourth proportional to 90,859.81, 125,380.29 and 56,866.87 is: 78,472.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,859.81 : 125,380.29 = 56,866.87 : x
  2. Step 2: Convert to fraction form
    90,859.81/125,380.29 = 56,866.87/x
  3. Step 3: Cross multiply
    90,859.81x = 125,380.29 × 56,866.87
  4. Step 4: Simplify right side
    90,859.81x = 7,129,984,651.99
  5. Step 5: Solve for x
    x = 7,129,984,651.99/90,859.81
  6. Step 6: Final answer
    x = 78,472.37

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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.