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Finding the Fourth Proportional to 315.12, 432.30 and 306.59

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Solution

The fourth proportional to 315.12, 432.30 and 306.59 is: 420.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.12 : 432.30 = 306.59 : x
  2. Step 2: Convert to fraction form
    315.12/432.30 = 306.59/x
  3. Step 3: Cross multiply
    315.12x = 432.30 × 306.59
  4. Step 4: Simplify right side
    315.12x = 132,536.70
  5. Step 5: Solve for x
    x = 132,536.70/315.12
  6. Step 6: Final answer
    x = 420.59

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.