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Finding the Fourth Proportional to 919.36, 1,269.42 and 722.50

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Solution

The fourth proportional to 919.36, 1,269.42 and 722.50 is: 997.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.36 : 1,269.42 = 722.50 : x
  2. Step 2: Convert to fraction form
    919.36/1,269.42 = 722.50/x
  3. Step 3: Cross multiply
    919.36x = 1,269.42 × 722.50
  4. Step 4: Simplify right side
    919.36x = 917,155.95
  5. Step 5: Solve for x
    x = 917,155.95/919.36
  6. Step 6: Final answer
    x = 997.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.