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Finding the Fourth Proportional to 758.88, 1,136.25 and 648.90

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Solution

The fourth proportional to 758.88, 1,136.25 and 648.90 is: 971.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.88 : 1,136.25 = 648.90 : x
  2. Step 2: Convert to fraction form
    758.88/1,136.25 = 648.90/x
  3. Step 3: Cross multiply
    758.88x = 1,136.25 × 648.90
  4. Step 4: Simplify right side
    758.88x = 737,312.63
  5. Step 5: Solve for x
    x = 737,312.63/758.88
  6. Step 6: Final answer
    x = 971.58

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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.