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Finding the Fourth Proportional to 509.95, 764.80 and 235.90

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Solution

The fourth proportional to 509.95, 764.80 and 235.90 is: 353.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.95 : 764.80 = 235.90 : x
  2. Step 2: Convert to fraction form
    509.95/764.80 = 235.90/x
  3. Step 3: Cross multiply
    509.95x = 764.80 × 235.90
  4. Step 4: Simplify right side
    509.95x = 180,413.82
  5. Step 5: Solve for x
    x = 180,413.82/509.95
  6. Step 6: Final answer
    x = 353.79

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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.