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Finding the Fourth Proportional to 913.91, 1,368.90 and 393.23

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Solution

The fourth proportional to 913.91, 1,368.90 and 393.23 is: 589.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.91 : 1,368.90 = 393.23 : x
  2. Step 2: Convert to fraction form
    913.91/1,368.90 = 393.23/x
  3. Step 3: Cross multiply
    913.91x = 1,368.90 × 393.23
  4. Step 4: Simplify right side
    913.91x = 538,285.70
  5. Step 5: Solve for x
    x = 538,285.70/913.91
  6. Step 6: Final answer
    x = 589.00

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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.