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Finding the Fourth Proportional to 665.52, 918.80 and 432.80

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Solution

The fourth proportional to 665.52, 918.80 and 432.80 is: 597.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.52 : 918.80 = 432.80 : x
  2. Step 2: Convert to fraction form
    665.52/918.80 = 432.80/x
  3. Step 3: Cross multiply
    665.52x = 918.80 × 432.80
  4. Step 4: Simplify right side
    665.52x = 397,656.64
  5. Step 5: Solve for x
    x = 397,656.64/665.52
  6. Step 6: Final answer
    x = 597.51

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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.