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Finding the Fourth Proportional to 935.67, 1,290.78 and 603.93

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Solution

The fourth proportional to 935.67, 1,290.78 and 603.93 is: 833.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.67 : 1,290.78 = 603.93 : x
  2. Step 2: Convert to fraction form
    935.67/1,290.78 = 603.93/x
  3. Step 3: Cross multiply
    935.67x = 1,290.78 × 603.93
  4. Step 4: Simplify right side
    935.67x = 779,540.77
  5. Step 5: Solve for x
    x = 779,540.77/935.67
  6. Step 6: Final answer
    x = 833.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.