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Finding the Fourth Proportional to 1,242.36, 1,715.01 and 822.90

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Solution

The fourth proportional to 1,242.36, 1,715.01 and 822.90 is: 1,135.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.36 : 1,715.01 = 822.90 : x
  2. Step 2: Convert to fraction form
    1,242.36/1,715.01 = 822.90/x
  3. Step 3: Cross multiply
    1,242.36x = 1,715.01 × 822.90
  4. Step 4: Simplify right side
    1,242.36x = 1,411,281.73
  5. Step 5: Solve for x
    x = 1,411,281.73/1,242.36
  6. Step 6: Final answer
    x = 1,135.97

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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.