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Finding the Fourth Proportional to 430.85, 646.18 and 156.87

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Solution

The fourth proportional to 430.85, 646.18 and 156.87 is: 235.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.85 : 646.18 = 156.87 : x
  2. Step 2: Convert to fraction form
    430.85/646.18 = 156.87/x
  3. Step 3: Cross multiply
    430.85x = 646.18 × 156.87
  4. Step 4: Simplify right side
    430.85x = 101,365.86
  5. Step 5: Solve for x
    x = 101,365.86/430.85
  6. Step 6: Final answer
    x = 235.27

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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.