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Finding the Fourth Proportional to 975.73, 1,347.06 and 645.11

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Solution

The fourth proportional to 975.73, 1,347.06 and 645.11 is: 890.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.73 : 1,347.06 = 645.11 : x
  2. Step 2: Convert to fraction form
    975.73/1,347.06 = 645.11/x
  3. Step 3: Cross multiply
    975.73x = 1,347.06 × 645.11
  4. Step 4: Simplify right side
    975.73x = 869,010.19
  5. Step 5: Solve for x
    x = 869,010.19/975.73
  6. Step 6: Final answer
    x = 890.63

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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.