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Finding the Fourth Proportional to 8,487.40, 12,739.20 and 4,332.10

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Solution

The fourth proportional to 8,487.40, 12,739.20 and 4,332.10 is: 6,502.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,487.40 : 12,739.20 = 4,332.10 : x
  2. Step 2: Convert to fraction form
    8,487.40/12,739.20 = 4,332.10/x
  3. Step 3: Cross multiply
    8,487.40x = 12,739.20 × 4,332.10
  4. Step 4: Simplify right side
    8,487.40x = 55,187,488.32
  5. Step 5: Solve for x
    x = 55,187,488.32/8,487.40
  6. Step 6: Final answer
    x = 6,502.28

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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.