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Finding the Fourth Proportional to 18,707.78, 25,807.82 and 11,149.76

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Solution

The fourth proportional to 18,707.78, 25,807.82 and 11,149.76 is: 15,381.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,707.78 : 25,807.82 = 11,149.76 : x
  2. Step 2: Convert to fraction form
    18,707.78/25,807.82 = 11,149.76/x
  3. Step 3: Cross multiply
    18,707.78x = 25,807.82 × 11,149.76
  4. Step 4: Simplify right side
    18,707.78x = 287,750,999.12
  5. Step 5: Solve for x
    x = 287,750,999.12/18,707.78
  6. Step 6: Final answer
    x = 15,381.35

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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.