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Finding the Fourth Proportional to 1,379.64, 2,068.58 and 648.48

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Solution

The fourth proportional to 1,379.64, 2,068.58 and 648.48 is: 972.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.64 : 2,068.58 = 648.48 : x
  2. Step 2: Convert to fraction form
    1,379.64/2,068.58 = 648.48/x
  3. Step 3: Cross multiply
    1,379.64x = 2,068.58 × 648.48
  4. Step 4: Simplify right side
    1,379.64x = 1,341,432.76
  5. Step 5: Solve for x
    x = 1,341,432.76/1,379.64
  6. Step 6: Final answer
    x = 972.31

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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.