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Finding the Fourth Proportional to 2,114.80, 3,172.20 and 654.10

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Solution

The fourth proportional to 2,114.80, 3,172.20 and 654.10 is: 981.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,114.80 : 3,172.20 = 654.10 : x
  2. Step 2: Convert to fraction form
    2,114.80/3,172.20 = 654.10/x
  3. Step 3: Cross multiply
    2,114.80x = 3,172.20 × 654.10
  4. Step 4: Simplify right side
    2,114.80x = 2,074,936.02
  5. Step 5: Solve for x
    x = 2,074,936.02/2,114.80
  6. Step 6: Final answer
    x = 981.15

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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.