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Finding the Fourth Proportional to 1,315.85, 1,815.96 and 756.48

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Solution

The fourth proportional to 1,315.85, 1,815.96 and 756.48 is: 1,043.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.85 : 1,815.96 = 756.48 : x
  2. Step 2: Convert to fraction form
    1,315.85/1,815.96 = 756.48/x
  3. Step 3: Cross multiply
    1,315.85x = 1,815.96 × 756.48
  4. Step 4: Simplify right side
    1,315.85x = 1,373,737.42
  5. Step 5: Solve for x
    x = 1,373,737.42/1,315.85
  6. Step 6: Final answer
    x = 1,043.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.