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Finding the Fourth Proportional to 917.18, 1,374.90 and 369.72

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Solution

The fourth proportional to 917.18, 1,374.90 and 369.72 is: 554.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.18 : 1,374.90 = 369.72 : x
  2. Step 2: Convert to fraction form
    917.18/1,374.90 = 369.72/x
  3. Step 3: Cross multiply
    917.18x = 1,374.90 × 369.72
  4. Step 4: Simplify right side
    917.18x = 508,328.03
  5. Step 5: Solve for x
    x = 508,328.03/917.18
  6. Step 6: Final answer
    x = 554.23

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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.