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Finding the Fourth Proportional to 1,358, 1,874.16 and 768.56

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Solution

The fourth proportional to 1,358, 1,874.16 and 768.56 is: 1,060.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358 : 1,874.16 = 768.56 : x
  2. Step 2: Convert to fraction form
    1,358/1,874.16 = 768.56/x
  3. Step 3: Cross multiply
    1,358x = 1,874.16 × 768.56
  4. Step 4: Simplify right side
    1,358x = 1,440,404.41
  5. Step 5: Solve for x
    x = 1,440,404.41/1,358
  6. Step 6: Final answer
    x = 1,060.68

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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.