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Finding the Fourth Proportional to 931.95, 1,394.69 and 643.59

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Solution

The fourth proportional to 931.95, 1,394.69 and 643.59 is: 963.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.95 : 1,394.69 = 643.59 : x
  2. Step 2: Convert to fraction form
    931.95/1,394.69 = 643.59/x
  3. Step 3: Cross multiply
    931.95x = 1,394.69 × 643.59
  4. Step 4: Simplify right side
    931.95x = 897,605.32
  5. Step 5: Solve for x
    x = 897,605.32/931.95
  6. Step 6: Final answer
    x = 963.15

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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.