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Finding the Fourth Proportional to 665.64, 998.58 and 570.12

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Solution

The fourth proportional to 665.64, 998.58 and 570.12 is: 855.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.64 : 998.58 = 570.12 : x
  2. Step 2: Convert to fraction form
    665.64/998.58 = 570.12/x
  3. Step 3: Cross multiply
    665.64x = 998.58 × 570.12
  4. Step 4: Simplify right side
    665.64x = 569,310.43
  5. Step 5: Solve for x
    x = 569,310.43/665.64
  6. Step 6: Final answer
    x = 855.28

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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.