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Finding the Fourth Proportional to 876.78, 1,315.17 and 260.53

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Solution

The fourth proportional to 876.78, 1,315.17 and 260.53 is: 390.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.78 : 1,315.17 = 260.53 : x
  2. Step 2: Convert to fraction form
    876.78/1,315.17 = 260.53/x
  3. Step 3: Cross multiply
    876.78x = 1,315.17 × 260.53
  4. Step 4: Simplify right side
    876.78x = 342,637.95
  5. Step 5: Solve for x
    x = 342,637.95/876.78
  6. Step 6: Final answer
    x = 390.79

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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.