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Finding the Fourth Proportional to 430.40, 645.68 and 156.48

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Solution

The fourth proportional to 430.40, 645.68 and 156.48 is: 234.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.40 : 645.68 = 156.48 : x
  2. Step 2: Convert to fraction form
    430.40/645.68 = 156.48/x
  3. Step 3: Cross multiply
    430.40x = 645.68 × 156.48
  4. Step 4: Simplify right side
    430.40x = 101,036.01
  5. Step 5: Solve for x
    x = 101,036.01/430.40
  6. Step 6: Final answer
    x = 234.75

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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.