Home / 20,712.76-31,068.72-5,130.16

Finding the Fourth Proportional to 20,712.76, 31,068.72 and 5,130.16

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Solution

The fourth proportional to 20,712.76, 31,068.72 and 5,130.16 is: 7,695.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,712.76 : 31,068.72 = 5,130.16 : x
  2. Step 2: Convert to fraction form
    20,712.76/31,068.72 = 5,130.16/x
  3. Step 3: Cross multiply
    20,712.76x = 31,068.72 × 5,130.16
  4. Step 4: Simplify right side
    20,712.76x = 159,387,504.60
  5. Step 5: Solve for x
    x = 159,387,504.60/20,712.76
  6. Step 6: Final answer
    x = 7,695.14

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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.