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Finding the Fourth Proportional to 665.88, 918.48 and 535.20

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Solution

The fourth proportional to 665.88, 918.48 and 535.20 is: 738.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.88 : 918.48 = 535.20 : x
  2. Step 2: Convert to fraction form
    665.88/918.48 = 535.20/x
  3. Step 3: Cross multiply
    665.88x = 918.48 × 535.20
  4. Step 4: Simplify right side
    665.88x = 491,570.50
  5. Step 5: Solve for x
    x = 491,570.50/665.88
  6. Step 6: Final answer
    x = 738.23

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Double scale
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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.