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Finding the Fourth Proportional to 1,243.95, 1,864.30 and 512.70

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Solution

The fourth proportional to 1,243.95, 1,864.30 and 512.70 is: 768.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.95 : 1,864.30 = 512.70 : x
  2. Step 2: Convert to fraction form
    1,243.95/1,864.30 = 512.70/x
  3. Step 3: Cross multiply
    1,243.95x = 1,864.30 × 512.70
  4. Step 4: Simplify right side
    1,243.95x = 955,826.61
  5. Step 5: Solve for x
    x = 955,826.61/1,243.95
  6. Step 6: Final answer
    x = 768.38

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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.