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Finding the Fourth Proportional to 917.55, 1,373.90 and 483.80

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Solution

The fourth proportional to 917.55, 1,373.90 and 483.80 is: 724.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.55 : 1,373.90 = 483.80 : x
  2. Step 2: Convert to fraction form
    917.55/1,373.90 = 483.80/x
  3. Step 3: Cross multiply
    917.55x = 1,373.90 × 483.80
  4. Step 4: Simplify right side
    917.55x = 664,683.53
  5. Step 5: Solve for x
    x = 664,683.53/917.55
  6. Step 6: Final answer
    x = 724.41

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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.