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Finding the Fourth Proportional to 8,658.90, 12,988.44 and 3,116.21

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Solution

The fourth proportional to 8,658.90, 12,988.44 and 3,116.21 is: 4,674.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,658.90 : 12,988.44 = 3,116.21 : x
  2. Step 2: Convert to fraction form
    8,658.90/12,988.44 = 3,116.21/x
  3. Step 3: Cross multiply
    8,658.90x = 12,988.44 × 3,116.21
  4. Step 4: Simplify right side
    8,658.90x = 40,474,641.67
  5. Step 5: Solve for x
    x = 40,474,641.67/8,658.90
  6. Step 6: Final answer
    x = 4,674.34

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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.