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Finding the Fourth Proportional to 1,315.80, 1,974.04 and 494.13

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Solution

The fourth proportional to 1,315.80, 1,974.04 and 494.13 is: 741.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.80 : 1,974.04 = 494.13 : x
  2. Step 2: Convert to fraction form
    1,315.80/1,974.04 = 494.13/x
  3. Step 3: Cross multiply
    1,315.80x = 1,974.04 × 494.13
  4. Step 4: Simplify right side
    1,315.80x = 975,432.39
  5. Step 5: Solve for x
    x = 975,432.39/1,315.80
  6. Step 6: Final answer
    x = 741.32

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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.