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Finding the Fourth Proportional to 621.01, 856.93 and 355.52

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Solution

The fourth proportional to 621.01, 856.93 and 355.52 is: 490.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.01 : 856.93 = 355.52 : x
  2. Step 2: Convert to fraction form
    621.01/856.93 = 355.52/x
  3. Step 3: Cross multiply
    621.01x = 856.93 × 355.52
  4. Step 4: Simplify right side
    621.01x = 304,655.75
  5. Step 5: Solve for x
    x = 304,655.75/621.01
  6. Step 6: Final answer
    x = 490.58

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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.