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Finding the Fourth Proportional to 259.56, 390.88 and 187.92

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Solution

The fourth proportional to 259.56, 390.88 and 187.92 is: 282.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.56 : 390.88 = 187.92 : x
  2. Step 2: Convert to fraction form
    259.56/390.88 = 187.92/x
  3. Step 3: Cross multiply
    259.56x = 390.88 × 187.92
  4. Step 4: Simplify right side
    259.56x = 73,454.17
  5. Step 5: Solve for x
    x = 73,454.17/259.56
  6. Step 6: Final answer
    x = 282.99

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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.