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Finding the Fourth Proportional to 943.55, 1,407.62 and 919.38

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Solution

The fourth proportional to 943.55, 1,407.62 and 919.38 is: 1,371.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.55 : 1,407.62 = 919.38 : x
  2. Step 2: Convert to fraction form
    943.55/1,407.62 = 919.38/x
  3. Step 3: Cross multiply
    943.55x = 1,407.62 × 919.38
  4. Step 4: Simplify right side
    943.55x = 1,294,133.08
  5. Step 5: Solve for x
    x = 1,294,133.08/943.55
  6. Step 6: Final answer
    x = 1,371.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.