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Finding the Fourth Proportional to 1,316.32, 1,974.59 and 342.42

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Solution

The fourth proportional to 1,316.32, 1,974.59 and 342.42 is: 513.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.32 : 1,974.59 = 342.42 : x
  2. Step 2: Convert to fraction form
    1,316.32/1,974.59 = 342.42/x
  3. Step 3: Cross multiply
    1,316.32x = 1,974.59 × 342.42
  4. Step 4: Simplify right side
    1,316.32x = 676,144.31
  5. Step 5: Solve for x
    x = 676,144.31/1,316.32
  6. Step 6: Final answer
    x = 513.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.