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Finding the Fourth Proportional to 913.16, 1,368.78 and 393.56

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Solution

The fourth proportional to 913.16, 1,368.78 and 393.56 is: 589.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.16 : 1,368.78 = 393.56 : x
  2. Step 2: Convert to fraction form
    913.16/1,368.78 = 393.56/x
  3. Step 3: Cross multiply
    913.16x = 1,368.78 × 393.56
  4. Step 4: Simplify right side
    913.16x = 538,697.06
  5. Step 5: Solve for x
    x = 538,697.06/913.16
  6. Step 6: Final answer
    x = 589.93

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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.