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Finding the Fourth Proportional to 973.63, 1,342.40 and 641.53

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Solution

The fourth proportional to 973.63, 1,342.40 and 641.53 is: 884.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.63 : 1,342.40 = 641.53 : x
  2. Step 2: Convert to fraction form
    973.63/1,342.40 = 641.53/x
  3. Step 3: Cross multiply
    973.63x = 1,342.40 × 641.53
  4. Step 4: Simplify right side
    973.63x = 861,183.31
  5. Step 5: Solve for x
    x = 861,183.31/973.63
  6. Step 6: Final answer
    x = 884.51

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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.