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Finding the Fourth Proportional to 661.48, 991.24 and 479.28

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Solution

The fourth proportional to 661.48, 991.24 and 479.28 is: 718.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.48 : 991.24 = 479.28 : x
  2. Step 2: Convert to fraction form
    661.48/991.24 = 479.28/x
  3. Step 3: Cross multiply
    661.48x = 991.24 × 479.28
  4. Step 4: Simplify right side
    661.48x = 475,081.51
  5. Step 5: Solve for x
    x = 475,081.51/661.48
  6. Step 6: Final answer
    x = 718.21

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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.