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Finding the Fourth Proportional to 1,401.76, 1,933.60 and 1,121.76

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Solution

The fourth proportional to 1,401.76, 1,933.60 and 1,121.76 is: 1,547.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,401.76 : 1,933.60 = 1,121.76 : x
  2. Step 2: Convert to fraction form
    1,401.76/1,933.60 = 1,121.76/x
  3. Step 3: Cross multiply
    1,401.76x = 1,933.60 × 1,121.76
  4. Step 4: Simplify right side
    1,401.76x = 2,169,035.14
  5. Step 5: Solve for x
    x = 2,169,035.14/1,401.76
  6. Step 6: Final answer
    x = 1,547.37

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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.