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Finding the Fourth Proportional to 1,291.64, 1,935.99 and 1,061.55

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Solution

The fourth proportional to 1,291.64, 1,935.99 and 1,061.55 is: 1,591.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.64 : 1,935.99 = 1,061.55 : x
  2. Step 2: Convert to fraction form
    1,291.64/1,935.99 = 1,061.55/x
  3. Step 3: Cross multiply
    1,291.64x = 1,935.99 × 1,061.55
  4. Step 4: Simplify right side
    1,291.64x = 2,055,150.18
  5. Step 5: Solve for x
    x = 2,055,150.18/1,291.64
  6. Step 6: Final answer
    x = 1,591.12

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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.