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Finding the Fourth Proportional to 715.41, 986.71 and 479.28

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Solution

The fourth proportional to 715.41, 986.71 and 479.28 is: 661.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.41 : 986.71 = 479.28 : x
  2. Step 2: Convert to fraction form
    715.41/986.71 = 479.28/x
  3. Step 3: Cross multiply
    715.41x = 986.71 × 479.28
  4. Step 4: Simplify right side
    715.41x = 472,908.26
  5. Step 5: Solve for x
    x = 472,908.26/715.41
  6. Step 6: Final answer
    x = 661.03

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