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Finding the Fourth Proportional to 661.60, 992.28 and 291.57

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Solution

The fourth proportional to 661.60, 992.28 and 291.57 is: 437.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.60 : 992.28 = 291.57 : x
  2. Step 2: Convert to fraction form
    661.60/992.28 = 291.57/x
  3. Step 3: Cross multiply
    661.60x = 992.28 × 291.57
  4. Step 4: Simplify right side
    661.60x = 289,319.08
  5. Step 5: Solve for x
    x = 289,319.08/661.60
  6. Step 6: Final answer
    x = 437.30

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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.