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Finding the Fourth Proportional to 316.38, 432.85 and 315.01

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Solution

The fourth proportional to 316.38, 432.85 and 315.01 is: 430.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.38 : 432.85 = 315.01 : x
  2. Step 2: Convert to fraction form
    316.38/432.85 = 315.01/x
  3. Step 3: Cross multiply
    316.38x = 432.85 × 315.01
  4. Step 4: Simplify right side
    316.38x = 136,352.08
  5. Step 5: Solve for x
    x = 136,352.08/316.38
  6. Step 6: Final answer
    x = 430.98

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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.