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Finding the Fourth Proportional to 20,140.40, 30,215.40 and 10,281.20

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Solution

The fourth proportional to 20,140.40, 30,215.40 and 10,281.20 is: 15,424.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,140.40 : 30,215.40 = 10,281.20 : x
  2. Step 2: Convert to fraction form
    20,140.40/30,215.40 = 10,281.20/x
  3. Step 3: Cross multiply
    20,140.40x = 30,215.40 × 10,281.20
  4. Step 4: Simplify right side
    20,140.40x = 310,650,570.48
  5. Step 5: Solve for x
    x = 310,650,570.48/20,140.40
  6. Step 6: Final answer
    x = 15,424.25

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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.