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Finding the Fourth Proportional to 1,292.34, 1,938.84 and 642.58

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Solution

The fourth proportional to 1,292.34, 1,938.84 and 642.58 is: 964.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.34 : 1,938.84 = 642.58 : x
  2. Step 2: Convert to fraction form
    1,292.34/1,938.84 = 642.58/x
  3. Step 3: Cross multiply
    1,292.34x = 1,938.84 × 642.58
  4. Step 4: Simplify right side
    1,292.34x = 1,245,859.81
  5. Step 5: Solve for x
    x = 1,245,859.81/1,292.34
  6. Step 6: Final answer
    x = 964.03

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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.