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Finding the Fourth Proportional to 861.84, 1,188.99 and 525.57

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Solution

The fourth proportional to 861.84, 1,188.99 and 525.57 is: 725.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.84 : 1,188.99 = 525.57 : x
  2. Step 2: Convert to fraction form
    861.84/1,188.99 = 525.57/x
  3. Step 3: Cross multiply
    861.84x = 1,188.99 × 525.57
  4. Step 4: Simplify right side
    861.84x = 624,897.47
  5. Step 5: Solve for x
    x = 624,897.47/861.84
  6. Step 6: Final answer
    x = 725.07

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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.