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Finding the Fourth Proportional to 973.08, 1,342.80 and 641.67

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Solution

The fourth proportional to 973.08, 1,342.80 and 641.67 is: 885.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.08 : 1,342.80 = 641.67 : x
  2. Step 2: Convert to fraction form
    973.08/1,342.80 = 641.67/x
  3. Step 3: Cross multiply
    973.08x = 1,342.80 × 641.67
  4. Step 4: Simplify right side
    973.08x = 861,634.48
  5. Step 5: Solve for x
    x = 861,634.48/973.08
  6. Step 6: Final answer
    x = 885.47

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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.