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Finding the Fourth Proportional to 314.40, 432.90 and 261.30

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Solution

The fourth proportional to 314.40, 432.90 and 261.30 is: 359.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.40 : 432.90 = 261.30 : x
  2. Step 2: Convert to fraction form
    314.40/432.90 = 261.30/x
  3. Step 3: Cross multiply
    314.40x = 432.90 × 261.30
  4. Step 4: Simplify right side
    314.40x = 113,116.77
  5. Step 5: Solve for x
    x = 113,116.77/314.40
  6. Step 6: Final answer
    x = 359.79

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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.