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Finding the Fourth Proportional to 1,115.93, 1,539.84 and 643.77

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Solution

The fourth proportional to 1,115.93, 1,539.84 and 643.77 is: 888.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.93 : 1,539.84 = 643.77 : x
  2. Step 2: Convert to fraction form
    1,115.93/1,539.84 = 643.77/x
  3. Step 3: Cross multiply
    1,115.93x = 1,539.84 × 643.77
  4. Step 4: Simplify right side
    1,115.93x = 991,302.80
  5. Step 5: Solve for x
    x = 991,302.80/1,115.93
  6. Step 6: Final answer
    x = 888.32

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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.