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Finding the Fourth Proportional to 893.76, 1,338.79 and 430.17

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Solution

The fourth proportional to 893.76, 1,338.79 and 430.17 is: 644.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.76 : 1,338.79 = 430.17 : x
  2. Step 2: Convert to fraction form
    893.76/1,338.79 = 430.17/x
  3. Step 3: Cross multiply
    893.76x = 1,338.79 × 430.17
  4. Step 4: Simplify right side
    893.76x = 575,907.29
  5. Step 5: Solve for x
    x = 575,907.29/893.76
  6. Step 6: Final answer
    x = 644.36

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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.