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Finding the Fourth Proportional to 1,126.40, 1,638.40 and 1,126.40

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Solution

The fourth proportional to 1,126.40, 1,638.40 and 1,126.40 is: 1,638.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.40 : 1,638.40 = 1,126.40 : x
  2. Step 2: Convert to fraction form
    1,126.40/1,638.40 = 1,126.40/x
  3. Step 3: Cross multiply
    1,126.40x = 1,638.40 × 1,126.40
  4. Step 4: Simplify right side
    1,126.40x = 1,845,493.76
  5. Step 5: Solve for x
    x = 1,845,493.76/1,126.40
  6. Step 6: Final answer
    x = 1,638.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.