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Finding the Fourth Proportional to 8,390.99, 12,588.75 and 7,472.86

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Solution

The fourth proportional to 8,390.99, 12,588.75 and 7,472.86 is: 11,211.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,390.99 : 12,588.75 = 7,472.86 : x
  2. Step 2: Convert to fraction form
    8,390.99/12,588.75 = 7,472.86/x
  3. Step 3: Cross multiply
    8,390.99x = 12,588.75 × 7,472.86
  4. Step 4: Simplify right side
    8,390.99x = 94,073,934.85
  5. Step 5: Solve for x
    x = 94,073,934.85/8,390.99
  6. Step 6: Final answer
    x = 11,211.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.