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Finding the Fourth Proportional to 287.02, 430.21 and 124.57

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Solution

The fourth proportional to 287.02, 430.21 and 124.57 is: 186.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.02 : 430.21 = 124.57 : x
  2. Step 2: Convert to fraction form
    287.02/430.21 = 124.57/x
  3. Step 3: Cross multiply
    287.02x = 430.21 × 124.57
  4. Step 4: Simplify right side
    287.02x = 53,591.26
  5. Step 5: Solve for x
    x = 53,591.26/287.02
  6. Step 6: Final answer
    x = 186.72

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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.