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Finding the Fourth Proportional to 718.09, 1,077.35 and 285.55

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Solution

The fourth proportional to 718.09, 1,077.35 and 285.55 is: 428.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.09 : 1,077.35 = 285.55 : x
  2. Step 2: Convert to fraction form
    718.09/1,077.35 = 285.55/x
  3. Step 3: Cross multiply
    718.09x = 1,077.35 × 285.55
  4. Step 4: Simplify right side
    718.09x = 307,637.29
  5. Step 5: Solve for x
    x = 307,637.29/718.09
  6. Step 6: Final answer
    x = 428.41

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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.