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Finding the Fourth Proportional to 259.10, 387.18 and 187.10

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Solution

The fourth proportional to 259.10, 387.18 and 187.10 is: 279.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.10 : 387.18 = 187.10 : x
  2. Step 2: Convert to fraction form
    259.10/387.18 = 187.10/x
  3. Step 3: Cross multiply
    259.10x = 387.18 × 187.10
  4. Step 4: Simplify right side
    259.10x = 72,441.38
  5. Step 5: Solve for x
    x = 72,441.38/259.10
  6. Step 6: Final answer
    x = 279.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.