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Finding the Fourth Proportional to 10,078.80, 15,121.80 and 4,237.20

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Solution

The fourth proportional to 10,078.80, 15,121.80 and 4,237.20 is: 6,357.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,078.80 : 15,121.80 = 4,237.20 : x
  2. Step 2: Convert to fraction form
    10,078.80/15,121.80 = 4,237.20/x
  3. Step 3: Cross multiply
    10,078.80x = 15,121.80 × 4,237.20
  4. Step 4: Simplify right side
    10,078.80x = 64,074,090.96
  5. Step 5: Solve for x
    x = 64,074,090.96/10,078.80
  6. Step 6: Final answer
    x = 6,357.31

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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.