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Finding the Fourth Proportional to 1,781.19, 2,672.73 and 915.51

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Solution

The fourth proportional to 1,781.19, 2,672.73 and 915.51 is: 1,373.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.19 : 2,672.73 = 915.51 : x
  2. Step 2: Convert to fraction form
    1,781.19/2,672.73 = 915.51/x
  3. Step 3: Cross multiply
    1,781.19x = 2,672.73 × 915.51
  4. Step 4: Simplify right side
    1,781.19x = 2,446,911.04
  5. Step 5: Solve for x
    x = 2,446,911.04/1,781.19
  6. Step 6: Final answer
    x = 1,373.75

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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.