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Finding the Fourth Proportional to 975.88, 1,346.50 and 661.20

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Solution

The fourth proportional to 975.88, 1,346.50 and 661.20 is: 912.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.88 : 1,346.50 = 661.20 : x
  2. Step 2: Convert to fraction form
    975.88/1,346.50 = 661.20/x
  3. Step 3: Cross multiply
    975.88x = 1,346.50 × 661.20
  4. Step 4: Simplify right side
    975.88x = 890,305.80
  5. Step 5: Solve for x
    x = 890,305.80/975.88
  6. Step 6: Final answer
    x = 912.31

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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.