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Finding the Fourth Proportional to 395.79, 545.00 and 312.63

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Solution

The fourth proportional to 395.79, 545.00 and 312.63 is: 430.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.79 : 545.00 = 312.63 : x
  2. Step 2: Convert to fraction form
    395.79/545.00 = 312.63/x
  3. Step 3: Cross multiply
    395.79x = 545.00 × 312.63
  4. Step 4: Simplify right side
    395.79x = 170,381.79
  5. Step 5: Solve for x
    x = 170,381.79/395.79
  6. Step 6: Final answer
    x = 430.49

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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.