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Finding the Fourth Proportional to 521.02, 777.88 and 429.90

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Solution

The fourth proportional to 521.02, 777.88 and 429.90 is: 641.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.02 : 777.88 = 429.90 : x
  2. Step 2: Convert to fraction form
    521.02/777.88 = 429.90/x
  3. Step 3: Cross multiply
    521.02x = 777.88 × 429.90
  4. Step 4: Simplify right side
    521.02x = 334,410.61
  5. Step 5: Solve for x
    x = 334,410.61/521.02
  6. Step 6: Final answer
    x = 641.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.