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Finding the Fourth Proportional to 1,388.41, 2,082.90 and 510.86

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Solution

The fourth proportional to 1,388.41, 2,082.90 and 510.86 is: 766.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.41 : 2,082.90 = 510.86 : x
  2. Step 2: Convert to fraction form
    1,388.41/2,082.90 = 510.86/x
  3. Step 3: Cross multiply
    1,388.41x = 2,082.90 × 510.86
  4. Step 4: Simplify right side
    1,388.41x = 1,064,070.29
  5. Step 5: Solve for x
    x = 1,064,070.29/1,388.41
  6. Step 6: Final answer
    x = 766.39

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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.