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Finding the Fourth Proportional to 1,051.29, 1,578.20 and 618.75

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Solution

The fourth proportional to 1,051.29, 1,578.20 and 618.75 is: 928.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,051.29 : 1,578.20 = 618.75 : x
  2. Step 2: Convert to fraction form
    1,051.29/1,578.20 = 618.75/x
  3. Step 3: Cross multiply
    1,051.29x = 1,578.20 × 618.75
  4. Step 4: Simplify right side
    1,051.29x = 976,508.16
  5. Step 5: Solve for x
    x = 976,508.16/1,051.29
  6. Step 6: Final answer
    x = 928.87

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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.