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Finding the Fourth Proportional to 1,378.74, 2,068.20 and 512.76

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Solution

The fourth proportional to 1,378.74, 2,068.20 and 512.76 is: 769.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.74 : 2,068.20 = 512.76 : x
  2. Step 2: Convert to fraction form
    1,378.74/2,068.20 = 512.76/x
  3. Step 3: Cross multiply
    1,378.74x = 2,068.20 × 512.76
  4. Step 4: Simplify right side
    1,378.74x = 1,060,490.23
  5. Step 5: Solve for x
    x = 1,060,490.23/1,378.74
  6. Step 6: Final answer
    x = 769.17

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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.