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Finding the Fourth Proportional to 1,376.85, 2,064.87 and 389.40

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Solution

The fourth proportional to 1,376.85, 2,064.87 and 389.40 is: 583.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.85 : 2,064.87 = 389.40 : x
  2. Step 2: Convert to fraction form
    1,376.85/2,064.87 = 389.40/x
  3. Step 3: Cross multiply
    1,376.85x = 2,064.87 × 389.40
  4. Step 4: Simplify right side
    1,376.85x = 804,060.38
  5. Step 5: Solve for x
    x = 804,060.38/1,376.85
  6. Step 6: Final answer
    x = 583.99

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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.