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Finding the Fourth Proportional to 561.32, 774.66 and 421.86

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Solution

The fourth proportional to 561.32, 774.66 and 421.86 is: 582.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.32 : 774.66 = 421.86 : x
  2. Step 2: Convert to fraction form
    561.32/774.66 = 421.86/x
  3. Step 3: Cross multiply
    561.32x = 774.66 × 421.86
  4. Step 4: Simplify right side
    561.32x = 326,798.07
  5. Step 5: Solve for x
    x = 326,798.07/561.32
  6. Step 6: Final answer
    x = 582.20

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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.