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Finding the Fourth Proportional to 13,490.40, 20,339.40 and 13,248.48

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Solution

The fourth proportional to 13,490.40, 20,339.40 and 13,248.48 is: 19,974.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,490.40 : 20,339.40 = 13,248.48 : x
  2. Step 2: Convert to fraction form
    13,490.40/20,339.40 = 13,248.48/x
  3. Step 3: Cross multiply
    13,490.40x = 20,339.40 × 13,248.48
  4. Step 4: Simplify right side
    13,490.40x = 269,466,134.11
  5. Step 5: Solve for x
    x = 269,466,134.11/13,490.40
  6. Step 6: Final answer
    x = 19,974.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.