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Finding the Fourth Proportional to 545.42, 752.65 and 309.31

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Solution

The fourth proportional to 545.42, 752.65 and 309.31 is: 426.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.42 : 752.65 = 309.31 : x
  2. Step 2: Convert to fraction form
    545.42/752.65 = 309.31/x
  3. Step 3: Cross multiply
    545.42x = 752.65 × 309.31
  4. Step 4: Simplify right side
    545.42x = 232,802.17
  5. Step 5: Solve for x
    x = 232,802.17/545.42
  6. Step 6: Final answer
    x = 426.83

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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.