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Finding the Fourth Proportional to 661.18, 990.70 and 569.44

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Solution

The fourth proportional to 661.18, 990.70 and 569.44 is: 853.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.18 : 990.70 = 569.44 : x
  2. Step 2: Convert to fraction form
    661.18/990.70 = 569.44/x
  3. Step 3: Cross multiply
    661.18x = 990.70 × 569.44
  4. Step 4: Simplify right side
    661.18x = 564,144.21
  5. Step 5: Solve for x
    x = 564,144.21/661.18
  6. Step 6: Final answer
    x = 853.24

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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.