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Finding the Fourth Proportional to 287.01, 430.58 and 140.84

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Solution

The fourth proportional to 287.01, 430.58 and 140.84 is: 211.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.01 : 430.58 = 140.84 : x
  2. Step 2: Convert to fraction form
    287.01/430.58 = 140.84/x
  3. Step 3: Cross multiply
    287.01x = 430.58 × 140.84
  4. Step 4: Simplify right side
    287.01x = 60,641.09
  5. Step 5: Solve for x
    x = 60,641.09/287.01
  6. Step 6: Final answer
    x = 211.29

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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.