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Finding the Fourth Proportional to 8,460.80, 12,666.24 and 6,279.20

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Solution

The fourth proportional to 8,460.80, 12,666.24 and 6,279.20 is: 9,400.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,460.80 : 12,666.24 = 6,279.20 : x
  2. Step 2: Convert to fraction form
    8,460.80/12,666.24 = 6,279.20/x
  3. Step 3: Cross multiply
    8,460.80x = 12,666.24 × 6,279.20
  4. Step 4: Simplify right side
    8,460.80x = 79,533,854.21
  5. Step 5: Solve for x
    x = 79,533,854.21/8,460.80
  6. Step 6: Final answer
    x = 9,400.28

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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.