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Finding the Fourth Proportional to 1,077.86, 1,487.45 and 704.61

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Solution

The fourth proportional to 1,077.86, 1,487.45 and 704.61 is: 972.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.86 : 1,487.45 = 704.61 : x
  2. Step 2: Convert to fraction form
    1,077.86/1,487.45 = 704.61/x
  3. Step 3: Cross multiply
    1,077.86x = 1,487.45 × 704.61
  4. Step 4: Simplify right side
    1,077.86x = 1,048,072.14
  5. Step 5: Solve for x
    x = 1,048,072.14/1,077.86
  6. Step 6: Final answer
    x = 972.36

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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.