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Finding the Fourth Proportional to 975.84, 1,346.67 and 728.31

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Solution

The fourth proportional to 975.84, 1,346.67 and 728.31 is: 1,005.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.84 : 1,346.67 = 728.31 : x
  2. Step 2: Convert to fraction form
    975.84/1,346.67 = 728.31/x
  3. Step 3: Cross multiply
    975.84x = 1,346.67 × 728.31
  4. Step 4: Simplify right side
    975.84x = 980,793.23
  5. Step 5: Solve for x
    x = 980,793.23/975.84
  6. Step 6: Final answer
    x = 1,005.08

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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.