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Finding the Fourth Proportional to 1,055.90, 1,583.86 and 987.86

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Solution

The fourth proportional to 1,055.90, 1,583.86 and 987.86 is: 1,481.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.90 : 1,583.86 = 987.86 : x
  2. Step 2: Convert to fraction form
    1,055.90/1,583.86 = 987.86/x
  3. Step 3: Cross multiply
    1,055.90x = 1,583.86 × 987.86
  4. Step 4: Simplify right side
    1,055.90x = 1,564,631.94
  5. Step 5: Solve for x
    x = 1,564,631.94/1,055.90
  6. Step 6: Final answer
    x = 1,481.80

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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.