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Finding the Fourth Proportional to 1,381.52, 2,072.84 and 651.15

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Solution

The fourth proportional to 1,381.52, 2,072.84 and 651.15 is: 976.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.52 : 2,072.84 = 651.15 : x
  2. Step 2: Convert to fraction form
    1,381.52/2,072.84 = 651.15/x
  3. Step 3: Cross multiply
    1,381.52x = 2,072.84 × 651.15
  4. Step 4: Simplify right side
    1,381.52x = 1,349,726.51
  5. Step 5: Solve for x
    x = 1,349,726.51/1,381.52
  6. Step 6: Final answer
    x = 976.98

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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.