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Finding the Fourth Proportional to 545.64, 817.74 and 407.58

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Solution

The fourth proportional to 545.64, 817.74 and 407.58 is: 610.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.64 : 817.74 = 407.58 : x
  2. Step 2: Convert to fraction form
    545.64/817.74 = 407.58/x
  3. Step 3: Cross multiply
    545.64x = 817.74 × 407.58
  4. Step 4: Simplify right side
    545.64x = 333,294.47
  5. Step 5: Solve for x
    x = 333,294.47/545.64
  6. Step 6: Final answer
    x = 610.83

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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.