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Finding the Fourth Proportional to 916.81, 1,375.52 and 368.85

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Solution

The fourth proportional to 916.81, 1,375.52 and 368.85 is: 553.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.81 : 1,375.52 = 368.85 : x
  2. Step 2: Convert to fraction form
    916.81/1,375.52 = 368.85/x
  3. Step 3: Cross multiply
    916.81x = 1,375.52 × 368.85
  4. Step 4: Simplify right side
    916.81x = 507,360.55
  5. Step 5: Solve for x
    x = 507,360.55/916.81
  6. Step 6: Final answer
    x = 553.40

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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.