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Finding the Fourth Proportional to 528.51, 727.70 and 479.91

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Solution

The fourth proportional to 528.51, 727.70 and 479.91 is: 660.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.51 : 727.70 = 479.91 : x
  2. Step 2: Convert to fraction form
    528.51/727.70 = 479.91/x
  3. Step 3: Cross multiply
    528.51x = 727.70 × 479.91
  4. Step 4: Simplify right side
    528.51x = 349,228.11
  5. Step 5: Solve for x
    x = 349,228.11/528.51
  6. Step 6: Final answer
    x = 660.78

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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.