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Finding the Fourth Proportional to 313.49, 432.63 and 288.38

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Solution

The fourth proportional to 313.49, 432.63 and 288.38 is: 397.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.49 : 432.63 = 288.38 : x
  2. Step 2: Convert to fraction form
    313.49/432.63 = 288.38/x
  3. Step 3: Cross multiply
    313.49x = 432.63 × 288.38
  4. Step 4: Simplify right side
    313.49x = 124,759.68
  5. Step 5: Solve for x
    x = 124,759.68/313.49
  6. Step 6: Final answer
    x = 397.98

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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.