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Finding the Fourth Proportional to 1,574.70, 2,172.99 and 985.02

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Solution

The fourth proportional to 1,574.70, 2,172.99 and 985.02 is: 1,359.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,574.70 : 2,172.99 = 985.02 : x
  2. Step 2: Convert to fraction form
    1,574.70/2,172.99 = 985.02/x
  3. Step 3: Cross multiply
    1,574.70x = 2,172.99 × 985.02
  4. Step 4: Simplify right side
    1,574.70x = 2,140,438.61
  5. Step 5: Solve for x
    x = 2,140,438.61/1,574.70
  6. Step 6: Final answer
    x = 1,359.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.