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Finding the Fourth Proportional to 587.28, 810.09 and 421.68

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Solution

The fourth proportional to 587.28, 810.09 and 421.68 is: 581.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.28 : 810.09 = 421.68 : x
  2. Step 2: Convert to fraction form
    587.28/810.09 = 421.68/x
  3. Step 3: Cross multiply
    587.28x = 810.09 × 421.68
  4. Step 4: Simplify right side
    587.28x = 341,598.75
  5. Step 5: Solve for x
    x = 341,598.75/587.28
  6. Step 6: Final answer
    x = 581.66

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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.