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Finding the Fourth Proportional to 642, 886.04 and 421.58

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Solution

The fourth proportional to 642, 886.04 and 421.58 is: 581.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    642 : 886.04 = 421.58 : x
  2. Step 2: Convert to fraction form
    642/886.04 = 421.58/x
  3. Step 3: Cross multiply
    642x = 886.04 × 421.58
  4. Step 4: Simplify right side
    642x = 373,536.74
  5. Step 5: Solve for x
    x = 373,536.74/642
  6. Step 6: Final answer
    x = 581.83

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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.