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Finding the Fourth Proportional to 430.72, 646.04 and 187.18

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Solution

The fourth proportional to 430.72, 646.04 and 187.18 is: 280.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.72 : 646.04 = 187.18 : x
  2. Step 2: Convert to fraction form
    430.72/646.04 = 187.18/x
  3. Step 3: Cross multiply
    430.72x = 646.04 × 187.18
  4. Step 4: Simplify right side
    430.72x = 120,924.62
  5. Step 5: Solve for x
    x = 120,924.62/430.72
  6. Step 6: Final answer
    x = 280.75

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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.