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Finding the Fourth Proportional to 389.91, 584.95 and 130.00

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Solution

The fourth proportional to 389.91, 584.95 and 130.00 is: 195.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.91 : 584.95 = 130.00 : x
  2. Step 2: Convert to fraction form
    389.91/584.95 = 130.00/x
  3. Step 3: Cross multiply
    389.91x = 584.95 × 130.00
  4. Step 4: Simplify right side
    389.91x = 76,041.04
  5. Step 5: Solve for x
    x = 76,041.04/389.91
  6. Step 6: Final answer
    x = 195.02

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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.