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Finding the Fourth Proportional to 430.47, 645.82 and 187.03

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Solution

The fourth proportional to 430.47, 645.82 and 187.03 is: 280.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.47 : 645.82 = 187.03 : x
  2. Step 2: Convert to fraction form
    430.47/645.82 = 187.03/x
  3. Step 3: Cross multiply
    430.47x = 645.82 × 187.03
  4. Step 4: Simplify right side
    430.47x = 120,787.71
  5. Step 5: Solve for x
    x = 120,787.71/430.47
  6. Step 6: Final answer
    x = 280.59

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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.