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Finding the Fourth Proportional to 317.76, 437.40 and 286.13

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Solution

The fourth proportional to 317.76, 437.40 and 286.13 is: 393.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.76 : 437.40 = 286.13 : x
  2. Step 2: Convert to fraction form
    317.76/437.40 = 286.13/x
  3. Step 3: Cross multiply
    317.76x = 437.40 × 286.13
  4. Step 4: Simplify right side
    317.76x = 125,151.08
  5. Step 5: Solve for x
    x = 125,151.08/317.76
  6. Step 6: Final answer
    x = 393.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.