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Finding the Fourth Proportional to 661.50, 991.52 and 295.78

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Solution

The fourth proportional to 661.50, 991.52 and 295.78 is: 443.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.50 : 991.52 = 295.78 : x
  2. Step 2: Convert to fraction form
    661.50/991.52 = 295.78/x
  3. Step 3: Cross multiply
    661.50x = 991.52 × 295.78
  4. Step 4: Simplify right side
    661.50x = 293,271.79
  5. Step 5: Solve for x
    x = 293,271.79/661.50
  6. Step 6: Final answer
    x = 443.34

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Double scale
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1.5x scale

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.