Home / 1,315.27-1,972.89-391.45

Finding the Fourth Proportional to 1,315.27, 1,972.89 and 391.45

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Solution

The fourth proportional to 1,315.27, 1,972.89 and 391.45 is: 587.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.27 : 1,972.89 = 391.45 : x
  2. Step 2: Convert to fraction form
    1,315.27/1,972.89 = 391.45/x
  3. Step 3: Cross multiply
    1,315.27x = 1,972.89 × 391.45
  4. Step 4: Simplify right side
    1,315.27x = 772,287.79
  5. Step 5: Solve for x
    x = 772,287.79/1,315.27
  6. Step 6: Final answer
    x = 587.17

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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.