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Finding the Fourth Proportional to 781.25, 1,170.35 and 415.53

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Solution

The fourth proportional to 781.25, 1,170.35 and 415.53 is: 622.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.25 : 1,170.35 = 415.53 : x
  2. Step 2: Convert to fraction form
    781.25/1,170.35 = 415.53/x
  3. Step 3: Cross multiply
    781.25x = 1,170.35 × 415.53
  4. Step 4: Simplify right side
    781.25x = 486,315.02
  5. Step 5: Solve for x
    x = 486,315.02/781.25
  6. Step 6: Final answer
    x = 622.49

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1.5x scale

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.