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Finding the Fourth Proportional to 935.21, 1,290.44 and 655.36

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Solution

The fourth proportional to 935.21, 1,290.44 and 655.36 is: 904.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.21 : 1,290.44 = 655.36 : x
  2. Step 2: Convert to fraction form
    935.21/1,290.44 = 655.36/x
  3. Step 3: Cross multiply
    935.21x = 1,290.44 × 655.36
  4. Step 4: Simplify right side
    935.21x = 845,701.17
  5. Step 5: Solve for x
    x = 845,701.17/935.21
  6. Step 6: Final answer
    x = 904.29

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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.