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Finding the Fourth Proportional to 973.58, 1,343.22 and 641.88

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Solution

The fourth proportional to 973.58, 1,343.22 and 641.88 is: 885.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.58 : 1,343.22 = 641.88 : x
  2. Step 2: Convert to fraction form
    973.58/1,343.22 = 641.88/x
  3. Step 3: Cross multiply
    973.58x = 1,343.22 × 641.88
  4. Step 4: Simplify right side
    973.58x = 862,186.05
  5. Step 5: Solve for x
    x = 862,186.05/973.58
  6. Step 6: Final answer
    x = 885.58

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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.