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Finding the Fourth Proportional to 1,188.78, 1,782.46 and 1,055.53

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Solution

The fourth proportional to 1,188.78, 1,782.46 and 1,055.53 is: 1,582.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.78 : 1,782.46 = 1,055.53 : x
  2. Step 2: Convert to fraction form
    1,188.78/1,782.46 = 1,055.53/x
  3. Step 3: Cross multiply
    1,188.78x = 1,782.46 × 1,055.53
  4. Step 4: Simplify right side
    1,188.78x = 1,881,440.00
  5. Step 5: Solve for x
    x = 1,881,440.00/1,188.78
  6. Step 6: Final answer
    x = 1,582.66

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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.