Home / 3,139.40-4,708.20-947.60

Finding the Fourth Proportional to 3,139.40, 4,708.20 and 947.60

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Solution

The fourth proportional to 3,139.40, 4,708.20 and 947.60 is: 1,421.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.40 : 4,708.20 = 947.60 : x
  2. Step 2: Convert to fraction form
    3,139.40/4,708.20 = 947.60/x
  3. Step 3: Cross multiply
    3,139.40x = 4,708.20 × 947.60
  4. Step 4: Simplify right side
    3,139.40x = 4,461,490.32
  5. Step 5: Solve for x
    x = 4,461,490.32/3,139.40
  6. Step 6: Final answer
    x = 1,421.13

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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.