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Finding the Fourth Proportional to 31,278.80, 43,162.80 and 17,130.80

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Solution

The fourth proportional to 31,278.80, 43,162.80 and 17,130.80 is: 23,639.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,278.80 : 43,162.80 = 17,130.80 : x
  2. Step 2: Convert to fraction form
    31,278.80/43,162.80 = 17,130.80/x
  3. Step 3: Cross multiply
    31,278.80x = 43,162.80 × 17,130.80
  4. Step 4: Simplify right side
    31,278.80x = 739,413,294.24
  5. Step 5: Solve for x
    x = 739,413,294.24/31,278.80
  6. Step 6: Final answer
    x = 23,639.44

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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.