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Finding the Fourth Proportional to 356.40, 492.88 and 312.66

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Solution

The fourth proportional to 356.40, 492.88 and 312.66 is: 432.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.40 : 492.88 = 312.66 : x
  2. Step 2: Convert to fraction form
    356.40/492.88 = 312.66/x
  3. Step 3: Cross multiply
    356.40x = 492.88 × 312.66
  4. Step 4: Simplify right side
    356.40x = 154,103.86
  5. Step 5: Solve for x
    x = 154,103.86/356.40
  6. Step 6: Final answer
    x = 432.39

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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.