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Finding the Fourth Proportional to 786.72, 1,085.43 and 524.78

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Solution

The fourth proportional to 786.72, 1,085.43 and 524.78 is: 724.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.72 : 1,085.43 = 524.78 : x
  2. Step 2: Convert to fraction form
    786.72/1,085.43 = 524.78/x
  3. Step 3: Cross multiply
    786.72x = 1,085.43 × 524.78
  4. Step 4: Simplify right side
    786.72x = 569,611.96
  5. Step 5: Solve for x
    x = 569,611.96/786.72
  6. Step 6: Final answer
    x = 724.03

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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.