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Finding the Fourth Proportional to 8,990.60, 12,411.60 and 5,635.40

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Solution

The fourth proportional to 8,990.60, 12,411.60 and 5,635.40 is: 7,779.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,990.60 : 12,411.60 = 5,635.40 : x
  2. Step 2: Convert to fraction form
    8,990.60/12,411.60 = 5,635.40/x
  3. Step 3: Cross multiply
    8,990.60x = 12,411.60 × 5,635.40
  4. Step 4: Simplify right side
    8,990.60x = 69,944,330.64
  5. Step 5: Solve for x
    x = 69,944,330.64/8,990.60
  6. Step 6: Final answer
    x = 7,779.72

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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.