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Finding the Fourth Proportional to 545.58, 751.82 and 421.25

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Solution

The fourth proportional to 545.58, 751.82 and 421.25 is: 580.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.58 : 751.82 = 421.25 : x
  2. Step 2: Convert to fraction form
    545.58/751.82 = 421.25/x
  3. Step 3: Cross multiply
    545.58x = 751.82 × 421.25
  4. Step 4: Simplify right side
    545.58x = 316,698.31
  5. Step 5: Solve for x
    x = 316,698.31/545.58
  6. Step 6: Final answer
    x = 580.48

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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.