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Finding the Fourth Proportional to 917.22, 1,374.47 and 369.11

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Solution

The fourth proportional to 917.22, 1,374.47 and 369.11 is: 553.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.22 : 1,374.47 = 369.11 : x
  2. Step 2: Convert to fraction form
    917.22/1,374.47 = 369.11/x
  3. Step 3: Cross multiply
    917.22x = 1,374.47 × 369.11
  4. Step 4: Simplify right side
    917.22x = 507,325.87
  5. Step 5: Solve for x
    x = 507,325.87/917.22
  6. Step 6: Final answer
    x = 553.11

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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.