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Finding the Fourth Proportional to 287.61, 430.69 and 230.49

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Solution

The fourth proportional to 287.61, 430.69 and 230.49 is: 345.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.61 : 430.69 = 230.49 : x
  2. Step 2: Convert to fraction form
    287.61/430.69 = 230.49/x
  3. Step 3: Cross multiply
    287.61x = 430.69 × 230.49
  4. Step 4: Simplify right side
    287.61x = 99,269.74
  5. Step 5: Solve for x
    x = 99,269.74/287.61
  6. Step 6: Final answer
    x = 345.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.