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Finding the Fourth Proportional to 1,403.56, 1,938.30 and 963.40

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Solution

The fourth proportional to 1,403.56, 1,938.30 and 963.40 is: 1,330.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.56 : 1,938.30 = 963.40 : x
  2. Step 2: Convert to fraction form
    1,403.56/1,938.30 = 963.40/x
  3. Step 3: Cross multiply
    1,403.56x = 1,938.30 × 963.40
  4. Step 4: Simplify right side
    1,403.56x = 1,867,358.22
  5. Step 5: Solve for x
    x = 1,867,358.22/1,403.56
  6. Step 6: Final answer
    x = 1,330.44

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1.5x scale

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.