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Finding the Fourth Proportional to 876.79, 1,315.19 and 260.49

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Solution

The fourth proportional to 876.79, 1,315.19 and 260.49 is: 390.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.79 : 1,315.19 = 260.49 : x
  2. Step 2: Convert to fraction form
    876.79/1,315.19 = 260.49/x
  3. Step 3: Cross multiply
    876.79x = 1,315.19 × 260.49
  4. Step 4: Simplify right side
    876.79x = 342,594.49
  5. Step 5: Solve for x
    x = 342,594.49/876.79
  6. Step 6: Final answer
    x = 390.74

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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.