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Finding the Fourth Proportional to 1,388.84, 2,085.10 and 1,274.22

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Solution

The fourth proportional to 1,388.84, 2,085.10 and 1,274.22 is: 1,913.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.84 : 2,085.10 = 1,274.22 : x
  2. Step 2: Convert to fraction form
    1,388.84/2,085.10 = 1,274.22/x
  3. Step 3: Cross multiply
    1,388.84x = 2,085.10 × 1,274.22
  4. Step 4: Simplify right side
    1,388.84x = 2,656,876.12
  5. Step 5: Solve for x
    x = 2,656,876.12/1,388.84
  6. Step 6: Final answer
    x = 1,913.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.