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Finding the Fourth Proportional to 1,293.19, 1,938.76 and 643.57

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Solution

The fourth proportional to 1,293.19, 1,938.76 and 643.57 is: 964.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.19 : 1,938.76 = 643.57 : x
  2. Step 2: Convert to fraction form
    1,293.19/1,938.76 = 643.57/x
  3. Step 3: Cross multiply
    1,293.19x = 1,938.76 × 643.57
  4. Step 4: Simplify right side
    1,293.19x = 1,247,727.77
  5. Step 5: Solve for x
    x = 1,247,727.77/1,293.19
  6. Step 6: Final answer
    x = 964.84

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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.