Home / 20,712.76-31,068.60-5,130.52

Finding the Fourth Proportional to 20,712.76, 31,068.60 and 5,130.52

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Solution

The fourth proportional to 20,712.76, 31,068.60 and 5,130.52 is: 7,695.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,712.76 : 31,068.60 = 5,130.52 : x
  2. Step 2: Convert to fraction form
    20,712.76/31,068.60 = 5,130.52/x
  3. Step 3: Cross multiply
    20,712.76x = 31,068.60 × 5,130.52
  4. Step 4: Simplify right side
    20,712.76x = 159,398,073.67
  5. Step 5: Solve for x
    x = 159,398,073.67/20,712.76
  6. Step 6: Final answer
    x = 7,695.65

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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.