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Finding the Fourth Proportional to 8,658.20, 12,987.30 and 2,815.40

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Solution

The fourth proportional to 8,658.20, 12,987.30 and 2,815.40 is: 4,223.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,658.20 : 12,987.30 = 2,815.40 : x
  2. Step 2: Convert to fraction form
    8,658.20/12,987.30 = 2,815.40/x
  3. Step 3: Cross multiply
    8,658.20x = 12,987.30 × 2,815.40
  4. Step 4: Simplify right side
    8,658.20x = 36,564,444.42
  5. Step 5: Solve for x
    x = 36,564,444.42/8,658.20
  6. Step 6: Final answer
    x = 4,223.10

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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.