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Finding the Fourth Proportional to 8,416.80, 12,612.40 and 7,111.20

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Solution

The fourth proportional to 8,416.80, 12,612.40 and 7,111.20 is: 10,655.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,416.80 : 12,612.40 = 7,111.20 : x
  2. Step 2: Convert to fraction form
    8,416.80/12,612.40 = 7,111.20/x
  3. Step 3: Cross multiply
    8,416.80x = 12,612.40 × 7,111.20
  4. Step 4: Simplify right side
    8,416.80x = 89,689,298.88
  5. Step 5: Solve for x
    x = 89,689,298.88/8,416.80
  6. Step 6: Final answer
    x = 10,655.99

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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.