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Finding the Fourth Proportional to 982.99, 1,471.89 and 787.08

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Solution

The fourth proportional to 982.99, 1,471.89 and 787.08 is: 1,178.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.99 : 1,471.89 = 787.08 : x
  2. Step 2: Convert to fraction form
    982.99/1,471.89 = 787.08/x
  3. Step 3: Cross multiply
    982.99x = 1,471.89 × 787.08
  4. Step 4: Simplify right side
    982.99x = 1,158,495.18
  5. Step 5: Solve for x
    x = 1,158,495.18/982.99
  6. Step 6: Final answer
    x = 1,178.54

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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.