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Finding the Fourth Proportional to 1,247.05, 1,868.85 and 985.90

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Solution

The fourth proportional to 1,247.05, 1,868.85 and 985.90 is: 1,477.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.05 : 1,868.85 = 985.90 : x
  2. Step 2: Convert to fraction form
    1,247.05/1,868.85 = 985.90/x
  3. Step 3: Cross multiply
    1,247.05x = 1,868.85 × 985.90
  4. Step 4: Simplify right side
    1,247.05x = 1,842,499.22
  5. Step 5: Solve for x
    x = 1,842,499.22/1,247.05
  6. Step 6: Final answer
    x = 1,477.49

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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.