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Finding the Fourth Proportional to 2,972.75, 4,459.40 and 781.49

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Solution

The fourth proportional to 2,972.75, 4,459.40 and 781.49 is: 1,172.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,972.75 : 4,459.40 = 781.49 : x
  2. Step 2: Convert to fraction form
    2,972.75/4,459.40 = 781.49/x
  3. Step 3: Cross multiply
    2,972.75x = 4,459.40 × 781.49
  4. Step 4: Simplify right side
    2,972.75x = 3,484,950.30
  5. Step 5: Solve for x
    x = 3,484,950.30/2,972.75
  6. Step 6: Final answer
    x = 1,172.30

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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.