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Finding the Fourth Proportional to 742.50, 1,114.95 and 621.66

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Solution

The fourth proportional to 742.50, 1,114.95 and 621.66 is: 933.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.50 : 1,114.95 = 621.66 : x
  2. Step 2: Convert to fraction form
    742.50/1,114.95 = 621.66/x
  3. Step 3: Cross multiply
    742.50x = 1,114.95 × 621.66
  4. Step 4: Simplify right side
    742.50x = 693,119.82
  5. Step 5: Solve for x
    x = 693,119.82/742.50
  6. Step 6: Final answer
    x = 933.49

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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.