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Finding the Fourth Proportional to 1,038.12, 1,554.27 and 781.80

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Solution

The fourth proportional to 1,038.12, 1,554.27 and 781.80 is: 1,170.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.12 : 1,554.27 = 781.80 : x
  2. Step 2: Convert to fraction form
    1,038.12/1,554.27 = 781.80/x
  3. Step 3: Cross multiply
    1,038.12x = 1,554.27 × 781.80
  4. Step 4: Simplify right side
    1,038.12x = 1,215,128.29
  5. Step 5: Solve for x
    x = 1,215,128.29/1,038.12
  6. Step 6: Final answer
    x = 1,170.51

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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.