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Finding the Fourth Proportional to 515.61, 711.60 and 319.18

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Solution

The fourth proportional to 515.61, 711.60 and 319.18 is: 440.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.61 : 711.60 = 319.18 : x
  2. Step 2: Convert to fraction form
    515.61/711.60 = 319.18/x
  3. Step 3: Cross multiply
    515.61x = 711.60 × 319.18
  4. Step 4: Simplify right side
    515.61x = 227,128.49
  5. Step 5: Solve for x
    x = 227,128.49/515.61
  6. Step 6: Final answer
    x = 440.50

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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.