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Finding the Fourth Proportional to 861.25, 1,188.50 and 525.46

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Solution

The fourth proportional to 861.25, 1,188.50 and 525.46 is: 725.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.25 : 1,188.50 = 525.46 : x
  2. Step 2: Convert to fraction form
    861.25/1,188.50 = 525.46/x
  3. Step 3: Cross multiply
    861.25x = 1,188.50 × 525.46
  4. Step 4: Simplify right side
    861.25x = 624,509.21
  5. Step 5: Solve for x
    x = 624,509.21/861.25
  6. Step 6: Final answer
    x = 725.12

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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.