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Finding the Fourth Proportional to 1,055.07, 1,582.20 and 890.55

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Solution

The fourth proportional to 1,055.07, 1,582.20 and 890.55 is: 1,335.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.07 : 1,582.20 = 890.55 : x
  2. Step 2: Convert to fraction form
    1,055.07/1,582.20 = 890.55/x
  3. Step 3: Cross multiply
    1,055.07x = 1,582.20 × 890.55
  4. Step 4: Simplify right side
    1,055.07x = 1,409,028.21
  5. Step 5: Solve for x
    x = 1,409,028.21/1,055.07
  6. Step 6: Final answer
    x = 1,335.48

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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.