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Finding the Fourth Proportional to 368.88, 509.40 and 299.76

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Solution

The fourth proportional to 368.88, 509.40 and 299.76 is: 413.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.88 : 509.40 = 299.76 : x
  2. Step 2: Convert to fraction form
    368.88/509.40 = 299.76/x
  3. Step 3: Cross multiply
    368.88x = 509.40 × 299.76
  4. Step 4: Simplify right side
    368.88x = 152,697.74
  5. Step 5: Solve for x
    x = 152,697.74/368.88
  6. Step 6: Final answer
    x = 413.95

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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.