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Finding the Fourth Proportional to 913.77, 1,369.71 and 393.93

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Solution

The fourth proportional to 913.77, 1,369.71 and 393.93 is: 590.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.77 : 1,369.71 = 393.93 : x
  2. Step 2: Convert to fraction form
    913.77/1,369.71 = 393.93/x
  3. Step 3: Cross multiply
    913.77x = 1,369.71 × 393.93
  4. Step 4: Simplify right side
    913.77x = 539,569.86
  5. Step 5: Solve for x
    x = 539,569.86/913.77
  6. Step 6: Final answer
    x = 590.49

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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.