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Finding the Fourth Proportional to 621.58, 857.63 and 345.58

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Solution

The fourth proportional to 621.58, 857.63 and 345.58 is: 476.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.58 : 857.63 = 345.58 : x
  2. Step 2: Convert to fraction form
    621.58/857.63 = 345.58/x
  3. Step 3: Cross multiply
    621.58x = 857.63 × 345.58
  4. Step 4: Simplify right side
    621.58x = 296,379.78
  5. Step 5: Solve for x
    x = 296,379.78/621.58
  6. Step 6: Final answer
    x = 476.82

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Double scale
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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.