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Finding the Fourth Proportional to 876.95, 1,315.25 and 260.65

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Solution

The fourth proportional to 876.95, 1,315.25 and 260.65 is: 390.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.95 : 1,315.25 = 260.65 : x
  2. Step 2: Convert to fraction form
    876.95/1,315.25 = 260.65/x
  3. Step 3: Cross multiply
    876.95x = 1,315.25 × 260.65
  4. Step 4: Simplify right side
    876.95x = 342,812.03
  5. Step 5: Solve for x
    x = 342,812.03/876.95
  6. Step 6: Final answer
    x = 390.91

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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.