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Finding the Fourth Proportional to 1,033.55, 1,426.64 and 661.53

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Solution

The fourth proportional to 1,033.55, 1,426.64 and 661.53 is: 913.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,033.55 : 1,426.64 = 661.53 : x
  2. Step 2: Convert to fraction form
    1,033.55/1,426.64 = 661.53/x
  3. Step 3: Cross multiply
    1,033.55x = 1,426.64 × 661.53
  4. Step 4: Simplify right side
    1,033.55x = 943,767.20
  5. Step 5: Solve for x
    x = 943,767.20/1,033.55
  6. Step 6: Final answer
    x = 913.13

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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.