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Finding the Fourth Proportional to 655.68, 904.86 and 422.76

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Solution

The fourth proportional to 655.68, 904.86 and 422.76 is: 583.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.68 : 904.86 = 422.76 : x
  2. Step 2: Convert to fraction form
    655.68/904.86 = 422.76/x
  3. Step 3: Cross multiply
    655.68x = 904.86 × 422.76
  4. Step 4: Simplify right side
    655.68x = 382,538.61
  5. Step 5: Solve for x
    x = 382,538.61/655.68
  6. Step 6: Final answer
    x = 583.42

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Find fourth proportional to 327.84, 452.43 and 211.38
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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.