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Finding the Fourth Proportional to 1,293.42, 1,938.78 and 644.52

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Solution

The fourth proportional to 1,293.42, 1,938.78 and 644.52 is: 966.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.42 : 1,938.78 = 644.52 : x
  2. Step 2: Convert to fraction form
    1,293.42/1,938.78 = 644.52/x
  3. Step 3: Cross multiply
    1,293.42x = 1,938.78 × 644.52
  4. Step 4: Simplify right side
    1,293.42x = 1,249,582.49
  5. Step 5: Solve for x
    x = 1,249,582.49/1,293.42
  6. Step 6: Final answer
    x = 966.11

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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.