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Finding the Fourth Proportional to 697.28, 1,045.90 and 286.30

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Solution

The fourth proportional to 697.28, 1,045.90 and 286.30 is: 429.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.28 : 1,045.90 = 286.30 : x
  2. Step 2: Convert to fraction form
    697.28/1,045.90 = 286.30/x
  3. Step 3: Cross multiply
    697.28x = 1,045.90 × 286.30
  4. Step 4: Simplify right side
    697.28x = 299,441.17
  5. Step 5: Solve for x
    x = 299,441.17/697.28
  6. Step 6: Final answer
    x = 429.44

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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.