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Finding the Fourth Proportional to 1,055.88, 1,455.90 and 992.31

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Solution

The fourth proportional to 1,055.88, 1,455.90 and 992.31 is: 1,368.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.88 : 1,455.90 = 992.31 : x
  2. Step 2: Convert to fraction form
    1,055.88/1,455.90 = 992.31/x
  3. Step 3: Cross multiply
    1,055.88x = 1,455.90 × 992.31
  4. Step 4: Simplify right side
    1,055.88x = 1,444,704.13
  5. Step 5: Solve for x
    x = 1,444,704.13/1,055.88
  6. Step 6: Final answer
    x = 1,368.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.