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Finding the Fourth Proportional to 1,400.45, 1,931.85 and 869.15

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Solution

The fourth proportional to 1,400.45, 1,931.85 and 869.15 is: 1,198.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.45 : 1,931.85 = 869.15 : x
  2. Step 2: Convert to fraction form
    1,400.45/1,931.85 = 869.15/x
  3. Step 3: Cross multiply
    1,400.45x = 1,931.85 × 869.15
  4. Step 4: Simplify right side
    1,400.45x = 1,679,072.26
  5. Step 5: Solve for x
    x = 1,679,072.26/1,400.45
  6. Step 6: Final answer
    x = 1,198.96

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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.