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Finding the Fourth Proportional to 621.53, 857.45 and 372.86

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Solution

The fourth proportional to 621.53, 857.45 and 372.86 is: 514.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.53 : 857.45 = 372.86 : x
  2. Step 2: Convert to fraction form
    621.53/857.45 = 372.86/x
  3. Step 3: Cross multiply
    621.53x = 857.45 × 372.86
  4. Step 4: Simplify right side
    621.53x = 319,702.66
  5. Step 5: Solve for x
    x = 319,702.66/621.53
  6. Step 6: Final answer
    x = 514.38

Related Problems

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Half scale
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Double scale
Find fourth proportional to 622.53, 858.82 and 373.86
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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.