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Finding the Fourth Proportional to 667.51, 1,000.55 and 505.91

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Solution

The fourth proportional to 667.51, 1,000.55 and 505.91 is: 758.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.51 : 1,000.55 = 505.91 : x
  2. Step 2: Convert to fraction form
    667.51/1,000.55 = 505.91/x
  3. Step 3: Cross multiply
    667.51x = 1,000.55 × 505.91
  4. Step 4: Simplify right side
    667.51x = 506,192.02
  5. Step 5: Solve for x
    x = 506,192.02/667.51
  6. Step 6: Final answer
    x = 758.33

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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.