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Finding the Fourth Proportional to 287.16, 430.65 and 124.74

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Solution

The fourth proportional to 287.16, 430.65 and 124.74 is: 187.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.16 : 430.65 = 124.74 : x
  2. Step 2: Convert to fraction form
    287.16/430.65 = 124.74/x
  3. Step 3: Cross multiply
    287.16x = 430.65 × 124.74
  4. Step 4: Simplify right side
    287.16x = 53,719.28
  5. Step 5: Solve for x
    x = 53,719.28/287.16
  6. Step 6: Final answer
    x = 187.07

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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.