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Finding the Fourth Proportional to 876.40, 1,315.95 and 511.90

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Solution

The fourth proportional to 876.40, 1,315.95 and 511.90 is: 768.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.40 : 1,315.95 = 511.90 : x
  2. Step 2: Convert to fraction form
    876.40/1,315.95 = 511.90/x
  3. Step 3: Cross multiply
    876.40x = 1,315.95 × 511.90
  4. Step 4: Simplify right side
    876.40x = 673,634.81
  5. Step 5: Solve for x
    x = 673,634.81/876.40
  6. Step 6: Final answer
    x = 768.64

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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.