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Finding the Fourth Proportional to 8,280.60, 12,412.80 and 4,117.20

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Solution

The fourth proportional to 8,280.60, 12,412.80 and 4,117.20 is: 6,171.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,280.60 : 12,412.80 = 4,117.20 : x
  2. Step 2: Convert to fraction form
    8,280.60/12,412.80 = 4,117.20/x
  3. Step 3: Cross multiply
    8,280.60x = 12,412.80 × 4,117.20
  4. Step 4: Simplify right side
    8,280.60x = 51,105,980.16
  5. Step 5: Solve for x
    x = 51,105,980.16/8,280.60
  6. Step 6: Final answer
    x = 6,171.77

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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.