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Finding the Fourth Proportional to 876.36, 1,314.08 and 389.20

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Solution

The fourth proportional to 876.36, 1,314.08 and 389.20 is: 583.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.36 : 1,314.08 = 389.20 : x
  2. Step 2: Convert to fraction form
    876.36/1,314.08 = 389.20/x
  3. Step 3: Cross multiply
    876.36x = 1,314.08 × 389.20
  4. Step 4: Simplify right side
    876.36x = 511,439.94
  5. Step 5: Solve for x
    x = 511,439.94/876.36
  6. Step 6: Final answer
    x = 583.60

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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.