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Finding the Fourth Proportional to 287.10, 430.68 and 124.80

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Solution

The fourth proportional to 287.10, 430.68 and 124.80 is: 187.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.10 : 430.68 = 124.80 : x
  2. Step 2: Convert to fraction form
    287.10/430.68 = 124.80/x
  3. Step 3: Cross multiply
    287.10x = 430.68 × 124.80
  4. Step 4: Simplify right side
    287.10x = 53,748.86
  5. Step 5: Solve for x
    x = 53,748.86/287.10
  6. Step 6: Final answer
    x = 187.21

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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.