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Finding the Fourth Proportional to 545.66, 753.05 and 309.61

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Solution

The fourth proportional to 545.66, 753.05 and 309.61 is: 427.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.66 : 753.05 = 309.61 : x
  2. Step 2: Convert to fraction form
    545.66/753.05 = 309.61/x
  3. Step 3: Cross multiply
    545.66x = 753.05 × 309.61
  4. Step 4: Simplify right side
    545.66x = 233,151.81
  5. Step 5: Solve for x
    x = 233,151.81/545.66
  6. Step 6: Final answer
    x = 427.28

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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.