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Finding the Fourth Proportional to 973.59, 1,342.76 and 641.90

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Solution

The fourth proportional to 973.59, 1,342.76 and 641.90 is: 885.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.59 : 1,342.76 = 641.90 : x
  2. Step 2: Convert to fraction form
    973.59/1,342.76 = 641.90/x
  3. Step 3: Cross multiply
    973.59x = 1,342.76 × 641.90
  4. Step 4: Simplify right side
    973.59x = 861,907.72
  5. Step 5: Solve for x
    x = 861,907.72/973.59
  6. Step 6: Final answer
    x = 885.29

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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.