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Finding the Fourth Proportional to 1,358.46, 1,874.67 and 768.99

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Solution

The fourth proportional to 1,358.46, 1,874.67 and 768.99 is: 1,061.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.46 : 1,874.67 = 768.99 : x
  2. Step 2: Convert to fraction form
    1,358.46/1,874.67 = 768.99/x
  3. Step 3: Cross multiply
    1,358.46x = 1,874.67 × 768.99
  4. Step 4: Simplify right side
    1,358.46x = 1,441,598.64
  5. Step 5: Solve for x
    x = 1,441,598.64/1,358.46
  6. Step 6: Final answer
    x = 1,061.20

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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.