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Finding the Fourth Proportional to 587.61, 811.08 and 421.92

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Solution

The fourth proportional to 587.61, 811.08 and 421.92 is: 582.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.61 : 811.08 = 421.92 : x
  2. Step 2: Convert to fraction form
    587.61/811.08 = 421.92/x
  3. Step 3: Cross multiply
    587.61x = 811.08 × 421.92
  4. Step 4: Simplify right side
    587.61x = 342,210.87
  5. Step 5: Solve for x
    x = 342,210.87/587.61
  6. Step 6: Final answer
    x = 582.38

Related Problems

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Half scale
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Double scale
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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.