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Finding the Fourth Proportional to 545.16, 752.29 and 309.12

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Solution

The fourth proportional to 545.16, 752.29 and 309.12 is: 426.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.16 : 752.29 = 309.12 : x
  2. Step 2: Convert to fraction form
    545.16/752.29 = 309.12/x
  3. Step 3: Cross multiply
    545.16x = 752.29 × 309.12
  4. Step 4: Simplify right side
    545.16x = 232,547.88
  5. Step 5: Solve for x
    x = 232,547.88/545.16
  6. Step 6: Final answer
    x = 426.57

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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.