Home / 21,279.90-31,907.28-8,785.92

Finding the Fourth Proportional to 21,279.90, 31,907.28 and 8,785.92

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Solution

The fourth proportional to 21,279.90, 31,907.28 and 8,785.92 is: 13,173.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.90 : 31,907.28 = 8,785.92 : x
  2. Step 2: Convert to fraction form
    21,279.90/31,907.28 = 8,785.92/x
  3. Step 3: Cross multiply
    21,279.90x = 31,907.28 × 8,785.92
  4. Step 4: Simplify right side
    21,279.90x = 280,334,809.50
  5. Step 5: Solve for x
    x = 280,334,809.50/21,279.90
  6. Step 6: Final answer
    x = 13,173.69

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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.