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Finding the Fourth Proportional to 609.90, 909.62 and 545.10

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Solution

The fourth proportional to 609.90, 909.62 and 545.10 is: 812.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.90 : 909.62 = 545.10 : x
  2. Step 2: Convert to fraction form
    609.90/909.62 = 545.10/x
  3. Step 3: Cross multiply
    609.90x = 909.62 × 545.10
  4. Step 4: Simplify right side
    609.90x = 495,831.14
  5. Step 5: Solve for x
    x = 495,831.14/609.90
  6. Step 6: Final answer
    x = 812.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.