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Finding the Fourth Proportional to 1,310.88, 1,966.32 and 661.16

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Solution

The fourth proportional to 1,310.88, 1,966.32 and 661.16 is: 991.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.88 : 1,966.32 = 661.16 : x
  2. Step 2: Convert to fraction form
    1,310.88/1,966.32 = 661.16/x
  3. Step 3: Cross multiply
    1,310.88x = 1,966.32 × 661.16
  4. Step 4: Simplify right side
    1,310.88x = 1,300,038.99
  5. Step 5: Solve for x
    x = 1,300,038.99/1,310.88
  6. Step 6: Final answer
    x = 991.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.