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Finding the Fourth Proportional to 561.78, 775.09 and 443.39

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Solution

The fourth proportional to 561.78, 775.09 and 443.39 is: 611.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.78 : 775.09 = 443.39 : x
  2. Step 2: Convert to fraction form
    561.78/775.09 = 443.39/x
  3. Step 3: Cross multiply
    561.78x = 775.09 × 443.39
  4. Step 4: Simplify right side
    561.78x = 343,663.83
  5. Step 5: Solve for x
    x = 343,663.83/561.78
  6. Step 6: Final answer
    x = 611.74

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Find fourth proportional to 562.78, 776.47 and 444.39
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1.5x scale

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.