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Finding the Fourth Proportional to 395.02, 545.43 and 307.90

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Solution

The fourth proportional to 395.02, 545.43 and 307.90 is: 425.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.02 : 545.43 = 307.90 : x
  2. Step 2: Convert to fraction form
    395.02/545.43 = 307.90/x
  3. Step 3: Cross multiply
    395.02x = 545.43 × 307.90
  4. Step 4: Simplify right side
    395.02x = 167,937.90
  5. Step 5: Solve for x
    x = 167,937.90/395.02
  6. Step 6: Final answer
    x = 425.14

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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.