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Finding the Fourth Proportional to 621.90, 858.40 and 360.08

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Solution

The fourth proportional to 621.90, 858.40 and 360.08 is: 497.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.90 : 858.40 = 360.08 : x
  2. Step 2: Convert to fraction form
    621.90/858.40 = 360.08/x
  3. Step 3: Cross multiply
    621.90x = 858.40 × 360.08
  4. Step 4: Simplify right side
    621.90x = 309,092.67
  5. Step 5: Solve for x
    x = 309,092.67/621.90
  6. Step 6: Final answer
    x = 497.01

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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.