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Finding the Fourth Proportional to 621.04, 855.12 and 515.92

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Solution

The fourth proportional to 621.04, 855.12 and 515.92 is: 710.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.04 : 855.12 = 515.92 : x
  2. Step 2: Convert to fraction form
    621.04/855.12 = 515.92/x
  3. Step 3: Cross multiply
    621.04x = 855.12 × 515.92
  4. Step 4: Simplify right side
    621.04x = 441,173.51
  5. Step 5: Solve for x
    x = 441,173.51/621.04
  6. Step 6: Final answer
    x = 710.38

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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.