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Finding the Fourth Proportional to 621.36, 855.09 and 510.39

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Solution

The fourth proportional to 621.36, 855.09 and 510.39 is: 702.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.36 : 855.09 = 510.39 : x
  2. Step 2: Convert to fraction form
    621.36/855.09 = 510.39/x
  3. Step 3: Cross multiply
    621.36x = 855.09 × 510.39
  4. Step 4: Simplify right side
    621.36x = 436,429.39
  5. Step 5: Solve for x
    x = 436,429.39/621.36
  6. Step 6: Final answer
    x = 702.38

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1.5x scale

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.