Home / 3,138.80-4,708.65-947.70

Finding the Fourth Proportional to 3,138.80, 4,708.65 and 947.70

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Solution

The fourth proportional to 3,138.80, 4,708.65 and 947.70 is: 1,421.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.80 : 4,708.65 = 947.70 : x
  2. Step 2: Convert to fraction form
    3,138.80/4,708.65 = 947.70/x
  3. Step 3: Cross multiply
    3,138.80x = 4,708.65 × 947.70
  4. Step 4: Simplify right side
    3,138.80x = 4,462,387.61
  5. Step 5: Solve for x
    x = 4,462,387.61/3,138.80
  6. Step 6: Final answer
    x = 1,421.69

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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.