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Finding the Fourth Proportional to 893.78, 1,341.13 and 425.78

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Solution

The fourth proportional to 893.78, 1,341.13 and 425.78 is: 638.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.78 : 1,341.13 = 425.78 : x
  2. Step 2: Convert to fraction form
    893.78/1,341.13 = 425.78/x
  3. Step 3: Cross multiply
    893.78x = 1,341.13 × 425.78
  4. Step 4: Simplify right side
    893.78x = 571,024.20
  5. Step 5: Solve for x
    x = 571,024.20/893.78
  6. Step 6: Final answer
    x = 638.89

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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.