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Finding the Fourth Proportional to 1,403.87, 1,938.24 and 1,256.25

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Solution

The fourth proportional to 1,403.87, 1,938.24 and 1,256.25 is: 1,734.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.87 : 1,938.24 = 1,256.25 : x
  2. Step 2: Convert to fraction form
    1,403.87/1,938.24 = 1,256.25/x
  3. Step 3: Cross multiply
    1,403.87x = 1,938.24 × 1,256.25
  4. Step 4: Simplify right side
    1,403.87x = 2,434,914
  5. Step 5: Solve for x
    x = 2,434,914/1,403.87
  6. Step 6: Final answer
    x = 1,734.43

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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.