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Finding the Fourth Proportional to 912.36, 1,368.90 and 399

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Solution

The fourth proportional to 912.36, 1,368.90 and 399 is: 598.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.36 : 1,368.90 = 399 : x
  2. Step 2: Convert to fraction form
    912.36/1,368.90 = 399/x
  3. Step 3: Cross multiply
    912.36x = 1,368.90 × 399
  4. Step 4: Simplify right side
    912.36x = 546,191.10
  5. Step 5: Solve for x
    x = 546,191.10/912.36
  6. Step 6: Final answer
    x = 598.66

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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.