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Finding the Fourth Proportional to 389.57, 583.67 and 287.10

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Solution

The fourth proportional to 389.57, 583.67 and 287.10 is: 430.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.57 : 583.67 = 287.10 : x
  2. Step 2: Convert to fraction form
    389.57/583.67 = 287.10/x
  3. Step 3: Cross multiply
    389.57x = 583.67 × 287.10
  4. Step 4: Simplify right side
    389.57x = 167,571.66
  5. Step 5: Solve for x
    x = 167,571.66/389.57
  6. Step 6: Final answer
    x = 430.15

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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.