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Finding the Fourth Proportional to 876.81, 1,315.40 and 673.95

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Solution

The fourth proportional to 876.81, 1,315.40 and 673.95 is: 1,011.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.81 : 1,315.40 = 673.95 : x
  2. Step 2: Convert to fraction form
    876.81/1,315.40 = 673.95/x
  3. Step 3: Cross multiply
    876.81x = 1,315.40 × 673.95
  4. Step 4: Simplify right side
    876.81x = 886,510.46
  5. Step 5: Solve for x
    x = 886,510.46/876.81
  6. Step 6: Final answer
    x = 1,011.06

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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.