Home / 10,279.40-15,428.70-8,820.20

Finding the Fourth Proportional to 10,279.40, 15,428.70 and 8,820.20

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Solution

The fourth proportional to 10,279.40, 15,428.70 and 8,820.20 is: 13,238.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,279.40 : 15,428.70 = 8,820.20 : x
  2. Step 2: Convert to fraction form
    10,279.40/15,428.70 = 8,820.20/x
  3. Step 3: Cross multiply
    10,279.40x = 15,428.70 × 8,820.20
  4. Step 4: Simplify right side
    10,279.40x = 136,084,219.74
  5. Step 5: Solve for x
    x = 136,084,219.74/10,279.40
  6. Step 6: Final answer
    x = 13,238.54

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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.