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Finding the Fourth Proportional to 1,055.86, 1,582.86 and 439.18

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Solution

The fourth proportional to 1,055.86, 1,582.86 and 439.18 is: 658.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.86 : 1,582.86 = 439.18 : x
  2. Step 2: Convert to fraction form
    1,055.86/1,582.86 = 439.18/x
  3. Step 3: Cross multiply
    1,055.86x = 1,582.86 × 439.18
  4. Step 4: Simplify right side
    1,055.86x = 695,160.45
  5. Step 5: Solve for x
    x = 695,160.45/1,055.86
  6. Step 6: Final answer
    x = 658.38

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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.