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Finding the Fourth Proportional to 1,051.79, 1,578.29 and 402.57

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Solution

The fourth proportional to 1,051.79, 1,578.29 and 402.57 is: 604.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,051.79 : 1,578.29 = 402.57 : x
  2. Step 2: Convert to fraction form
    1,051.79/1,578.29 = 402.57/x
  3. Step 3: Cross multiply
    1,051.79x = 1,578.29 × 402.57
  4. Step 4: Simplify right side
    1,051.79x = 635,370.19
  5. Step 5: Solve for x
    x = 635,370.19/1,051.79
  6. Step 6: Final answer
    x = 604.09

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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.