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Finding the Fourth Proportional to 545.21, 751.61 and 389.69

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Solution

The fourth proportional to 545.21, 751.61 and 389.69 is: 537.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.21 : 751.61 = 389.69 : x
  2. Step 2: Convert to fraction form
    545.21/751.61 = 389.69/x
  3. Step 3: Cross multiply
    545.21x = 751.61 × 389.69
  4. Step 4: Simplify right side
    545.21x = 292,894.90
  5. Step 5: Solve for x
    x = 292,894.90/545.21
  6. Step 6: Final answer
    x = 537.21

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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.