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Finding the Fourth Proportional to 538.16, 807.38 and 390.64

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Solution

The fourth proportional to 538.16, 807.38 and 390.64 is: 586.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.16 : 807.38 = 390.64 : x
  2. Step 2: Convert to fraction form
    538.16/807.38 = 390.64/x
  3. Step 3: Cross multiply
    538.16x = 807.38 × 390.64
  4. Step 4: Simplify right side
    538.16x = 315,394.92
  5. Step 5: Solve for x
    x = 315,394.92/538.16
  6. Step 6: Final answer
    x = 586.06

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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.