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Finding the Fourth Proportional to 8,909.40, 12,311.25 and 8,477.08

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Solution

The fourth proportional to 8,909.40, 12,311.25 and 8,477.08 is: 11,713.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,909.40 : 12,311.25 = 8,477.08 : x
  2. Step 2: Convert to fraction form
    8,909.40/12,311.25 = 8,477.08/x
  3. Step 3: Cross multiply
    8,909.40x = 12,311.25 × 8,477.08
  4. Step 4: Simplify right side
    8,909.40x = 104,363,420.37
  5. Step 5: Solve for x
    x = 104,363,420.37/8,909.40
  6. Step 6: Final answer
    x = 11,713.86

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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.