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Finding the Fourth Proportional to 1,051.72, 1,577.96 and 321.48

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Solution

The fourth proportional to 1,051.72, 1,577.96 and 321.48 is: 482.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,051.72 : 1,577.96 = 321.48 : x
  2. Step 2: Convert to fraction form
    1,051.72/1,577.96 = 321.48/x
  3. Step 3: Cross multiply
    1,051.72x = 1,577.96 × 321.48
  4. Step 4: Simplify right side
    1,051.72x = 507,282.58
  5. Step 5: Solve for x
    x = 507,282.58/1,051.72
  6. Step 6: Final answer
    x = 482.34

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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.