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Finding the Fourth Proportional to 1,315.70, 1,972.98 and 391.04

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Solution

The fourth proportional to 1,315.70, 1,972.98 and 391.04 is: 586.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.70 : 1,972.98 = 391.04 : x
  2. Step 2: Convert to fraction form
    1,315.70/1,972.98 = 391.04/x
  3. Step 3: Cross multiply
    1,315.70x = 1,972.98 × 391.04
  4. Step 4: Simplify right side
    1,315.70x = 771,514.10
  5. Step 5: Solve for x
    x = 771,514.10/1,315.70
  6. Step 6: Final answer
    x = 586.39

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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.