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Finding the Fourth Proportional to 1,431.54, 2,145.49 and 691.00

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Solution

The fourth proportional to 1,431.54, 2,145.49 and 691.00 is: 1,035.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.54 : 2,145.49 = 691.00 : x
  2. Step 2: Convert to fraction form
    1,431.54/2,145.49 = 691.00/x
  3. Step 3: Cross multiply
    1,431.54x = 2,145.49 × 691.00
  4. Step 4: Simplify right side
    1,431.54x = 1,482,526.50
  5. Step 5: Solve for x
    x = 1,482,526.50/1,431.54
  6. Step 6: Final answer
    x = 1,035.62

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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.