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Finding the Fourth Proportional to 1,169.20, 1,752.60 and 648.40

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Solution

The fourth proportional to 1,169.20, 1,752.60 and 648.40 is: 971.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.20 : 1,752.60 = 648.40 : x
  2. Step 2: Convert to fraction form
    1,169.20/1,752.60 = 648.40/x
  3. Step 3: Cross multiply
    1,169.20x = 1,752.60 × 648.40
  4. Step 4: Simplify right side
    1,169.20x = 1,136,385.84
  5. Step 5: Solve for x
    x = 1,136,385.84/1,169.20
  6. Step 6: Final answer
    x = 971.93

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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.