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Finding the Fourth Proportional to 545.40, 817 and 448.20

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Solution

The fourth proportional to 545.40, 817 and 448.20 is: 671.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.40 : 817 = 448.20 : x
  2. Step 2: Convert to fraction form
    545.40/817 = 448.20/x
  3. Step 3: Cross multiply
    545.40x = 817 × 448.20
  4. Step 4: Simplify right side
    545.40x = 366,179.40
  5. Step 5: Solve for x
    x = 366,179.40/545.40
  6. Step 6: Final answer
    x = 671.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.