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Finding the Fourth Proportional to 1,388.48, 2,082.35 and 555.51

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Solution

The fourth proportional to 1,388.48, 2,082.35 and 555.51 is: 833.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.48 : 2,082.35 = 555.51 : x
  2. Step 2: Convert to fraction form
    1,388.48/2,082.35 = 555.51/x
  3. Step 3: Cross multiply
    1,388.48x = 2,082.35 × 555.51
  4. Step 4: Simplify right side
    1,388.48x = 1,156,766.25
  5. Step 5: Solve for x
    x = 1,156,766.25/1,388.48
  6. Step 6: Final answer
    x = 833.12

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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.