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Finding the Fourth Proportional to 3,121.18, 4,681.73 and 781.18

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Solution

The fourth proportional to 3,121.18, 4,681.73 and 781.18 is: 1,171.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.18 : 4,681.73 = 781.18 : x
  2. Step 2: Convert to fraction form
    3,121.18/4,681.73 = 781.18/x
  3. Step 3: Cross multiply
    3,121.18x = 4,681.73 × 781.18
  4. Step 4: Simplify right side
    3,121.18x = 3,657,261.16
  5. Step 5: Solve for x
    x = 3,657,261.16/3,121.18
  6. Step 6: Final answer
    x = 1,171.76

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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.