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Finding the Fourth Proportional to 973.28, 1,342.54 and 641.58

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Solution

The fourth proportional to 973.28, 1,342.54 and 641.58 is: 884.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.28 : 1,342.54 = 641.58 : x
  2. Step 2: Convert to fraction form
    973.28/1,342.54 = 641.58/x
  3. Step 3: Cross multiply
    973.28x = 1,342.54 × 641.58
  4. Step 4: Simplify right side
    973.28x = 861,346.81
  5. Step 5: Solve for x
    x = 861,346.81/973.28
  6. Step 6: Final answer
    x = 884.99

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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.