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Finding the Fourth Proportional to 15,393.40, 21,242.76 and 8,319.76

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Solution

The fourth proportional to 15,393.40, 21,242.76 and 8,319.76 is: 11,481.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,393.40 : 21,242.76 = 8,319.76 : x
  2. Step 2: Convert to fraction form
    15,393.40/21,242.76 = 8,319.76/x
  3. Step 3: Cross multiply
    15,393.40x = 21,242.76 × 8,319.76
  4. Step 4: Simplify right side
    15,393.40x = 176,734,664.94
  5. Step 5: Solve for x
    x = 176,734,664.94/15,393.40
  6. Step 6: Final answer
    x = 11,481.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.