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Finding the Fourth Proportional to 1,217.23, 1,822.80 and 907.40

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Solution

The fourth proportional to 1,217.23, 1,822.80 and 907.40 is: 1,358.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.23 : 1,822.80 = 907.40 : x
  2. Step 2: Convert to fraction form
    1,217.23/1,822.80 = 907.40/x
  3. Step 3: Cross multiply
    1,217.23x = 1,822.80 × 907.40
  4. Step 4: Simplify right side
    1,217.23x = 1,654,008.72
  5. Step 5: Solve for x
    x = 1,654,008.72/1,217.23
  6. Step 6: Final answer
    x = 1,358.83

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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.