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Finding the Fourth Proportional to 909.98, 1,365.31 and 545.03

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Solution

The fourth proportional to 909.98, 1,365.31 and 545.03 is: 817.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.98 : 1,365.31 = 545.03 : x
  2. Step 2: Convert to fraction form
    909.98/1,365.31 = 545.03/x
  3. Step 3: Cross multiply
    909.98x = 1,365.31 × 545.03
  4. Step 4: Simplify right side
    909.98x = 744,133.88
  5. Step 5: Solve for x
    x = 744,133.88/909.98
  6. Step 6: Final answer
    x = 817.75

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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.