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Finding the Fourth Proportional to 510.40, 705 and 395.38

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Solution

The fourth proportional to 510.40, 705 and 395.38 is: 546.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.40 : 705 = 395.38 : x
  2. Step 2: Convert to fraction form
    510.40/705 = 395.38/x
  3. Step 3: Cross multiply
    510.40x = 705 × 395.38
  4. Step 4: Simplify right side
    510.40x = 278,742.90
  5. Step 5: Solve for x
    x = 278,742.90/510.40
  6. Step 6: Final answer
    x = 546.13

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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.