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Finding the Fourth Proportional to 509.64, 703.38 and 385.10

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Solution

The fourth proportional to 509.64, 703.38 and 385.10 is: 531.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.64 : 703.38 = 385.10 : x
  2. Step 2: Convert to fraction form
    509.64/703.38 = 385.10/x
  3. Step 3: Cross multiply
    509.64x = 703.38 × 385.10
  4. Step 4: Simplify right side
    509.64x = 270,871.64
  5. Step 5: Solve for x
    x = 270,871.64/509.64
  6. Step 6: Final answer
    x = 531.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.