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Finding the Fourth Proportional to 973.82, 1,343.58 and 642.13

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Solution

The fourth proportional to 973.82, 1,343.58 and 642.13 is: 885.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.82 : 1,343.58 = 642.13 : x
  2. Step 2: Convert to fraction form
    973.82/1,343.58 = 642.13/x
  3. Step 3: Cross multiply
    973.82x = 1,343.58 × 642.13
  4. Step 4: Simplify right side
    973.82x = 862,753.03
  5. Step 5: Solve for x
    x = 862,753.03/973.82
  6. Step 6: Final answer
    x = 885.95

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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.