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Finding the Fourth Proportional to 611.24, 917.40 and 489.20

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Solution

The fourth proportional to 611.24, 917.40 and 489.20 is: 734.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.24 : 917.40 = 489.20 : x
  2. Step 2: Convert to fraction form
    611.24/917.40 = 489.20/x
  3. Step 3: Cross multiply
    611.24x = 917.40 × 489.20
  4. Step 4: Simplify right side
    611.24x = 448,792.08
  5. Step 5: Solve for x
    x = 448,792.08/611.24
  6. Step 6: Final answer
    x = 734.23

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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.