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Finding the Fourth Proportional to 1,051.58, 1,577.55 and 393.69

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Solution

The fourth proportional to 1,051.58, 1,577.55 and 393.69 is: 590.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,051.58 : 1,577.55 = 393.69 : x
  2. Step 2: Convert to fraction form
    1,051.58/1,577.55 = 393.69/x
  3. Step 3: Cross multiply
    1,051.58x = 1,577.55 × 393.69
  4. Step 4: Simplify right side
    1,051.58x = 621,066.40
  5. Step 5: Solve for x
    x = 621,066.40/1,051.58
  6. Step 6: Final answer
    x = 590.60

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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.