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Finding the Fourth Proportional to 8,658.57, 12,988.76 and 3,977.78

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Solution

The fourth proportional to 8,658.57, 12,988.76 and 3,977.78 is: 5,967.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,658.57 : 12,988.76 = 3,977.78 : x
  2. Step 2: Convert to fraction form
    8,658.57/12,988.76 = 3,977.78/x
  3. Step 3: Cross multiply
    8,658.57x = 12,988.76 × 3,977.78
  4. Step 4: Simplify right side
    8,658.57x = 51,666,344.92
  5. Step 5: Solve for x
    x = 51,666,344.92/8,658.57
  6. Step 6: Final answer
    x = 5,967.08

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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.