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Finding the Fourth Proportional to 665.19, 918.41 and 565.29

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Solution

The fourth proportional to 665.19, 918.41 and 565.29 is: 780.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.19 : 918.41 = 565.29 : x
  2. Step 2: Convert to fraction form
    665.19/918.41 = 565.29/x
  3. Step 3: Cross multiply
    665.19x = 918.41 × 565.29
  4. Step 4: Simplify right side
    665.19x = 519,165.16
  5. Step 5: Solve for x
    x = 519,165.16/665.19
  6. Step 6: Final answer
    x = 780.48

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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.