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Finding the Fourth Proportional to 515.16, 711.72 and 478.71

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Solution

The fourth proportional to 515.16, 711.72 and 478.71 is: 661.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.16 : 711.72 = 478.71 : x
  2. Step 2: Convert to fraction form
    515.16/711.72 = 478.71/x
  3. Step 3: Cross multiply
    515.16x = 711.72 × 478.71
  4. Step 4: Simplify right side
    515.16x = 340,707.48
  5. Step 5: Solve for x
    x = 340,707.48/515.16
  6. Step 6: Final answer
    x = 661.36

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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.