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Finding the Fourth Proportional to 561.23, 840.73 and 438.92

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Solution

The fourth proportional to 561.23, 840.73 and 438.92 is: 657.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.23 : 840.73 = 438.92 : x
  2. Step 2: Convert to fraction form
    561.23/840.73 = 438.92/x
  3. Step 3: Cross multiply
    561.23x = 840.73 × 438.92
  4. Step 4: Simplify right side
    561.23x = 369,016.41
  5. Step 5: Solve for x
    x = 369,016.41/561.23
  6. Step 6: Final answer
    x = 657.51

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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.