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Finding the Fourth Proportional to 1,038.78, 1,434.24 and 645.93

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Solution

The fourth proportional to 1,038.78, 1,434.24 and 645.93 is: 891.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.78 : 1,434.24 = 645.93 : x
  2. Step 2: Convert to fraction form
    1,038.78/1,434.24 = 645.93/x
  3. Step 3: Cross multiply
    1,038.78x = 1,434.24 × 645.93
  4. Step 4: Simplify right side
    1,038.78x = 926,418.64
  5. Step 5: Solve for x
    x = 926,418.64/1,038.78
  6. Step 6: Final answer
    x = 891.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.