Home / 20,788.76-31,182.18-7,640.16

Finding the Fourth Proportional to 20,788.76, 31,182.18 and 7,640.16

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Solution

The fourth proportional to 20,788.76, 31,182.18 and 7,640.16 is: 11,459.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,788.76 : 31,182.18 = 7,640.16 : x
  2. Step 2: Convert to fraction form
    20,788.76/31,182.18 = 7,640.16/x
  3. Step 3: Cross multiply
    20,788.76x = 31,182.18 × 7,640.16
  4. Step 4: Simplify right side
    20,788.76x = 238,236,844.35
  5. Step 5: Solve for x
    x = 238,236,844.35/20,788.76
  6. Step 6: Final answer
    x = 11,459.89

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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.