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Finding the Fourth Proportional to 1,015.02, 1,521.31 and 429.66

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Solution

The fourth proportional to 1,015.02, 1,521.31 and 429.66 is: 643.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.02 : 1,521.31 = 429.66 : x
  2. Step 2: Convert to fraction form
    1,015.02/1,521.31 = 429.66/x
  3. Step 3: Cross multiply
    1,015.02x = 1,521.31 × 429.66
  4. Step 4: Simplify right side
    1,015.02x = 653,646.05
  5. Step 5: Solve for x
    x = 653,646.05/1,015.02
  6. Step 6: Final answer
    x = 643.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.