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Finding the Fourth Proportional to 697.09, 1,045.40 and 286.11

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Solution

The fourth proportional to 697.09, 1,045.40 and 286.11 is: 429.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.09 : 1,045.40 = 286.11 : x
  2. Step 2: Convert to fraction form
    697.09/1,045.40 = 286.11/x
  3. Step 3: Cross multiply
    697.09x = 1,045.40 × 286.11
  4. Step 4: Simplify right side
    697.09x = 299,097.96
  5. Step 5: Solve for x
    x = 299,097.96/697.09
  6. Step 6: Final answer
    x = 429.07

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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.