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Finding the Fourth Proportional to 621.42, 857.54 and 372.77

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Solution

The fourth proportional to 621.42, 857.54 and 372.77 is: 514.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.42 : 857.54 = 372.77 : x
  2. Step 2: Convert to fraction form
    621.42/857.54 = 372.77/x
  3. Step 3: Cross multiply
    621.42x = 857.54 × 372.77
  4. Step 4: Simplify right side
    621.42x = 319,659.03
  5. Step 5: Solve for x
    x = 319,659.03/621.42
  6. Step 6: Final answer
    x = 514.40

Related Problems

Find fourth proportional to 310.71, 428.77 and 186.38
Half scale
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Double scale
Find fourth proportional to 622.42, 858.91 and 373.77
Similar ratio
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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.