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Finding the Fourth Proportional to 1,116.10, 1,539.80 and 643.66

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Solution

The fourth proportional to 1,116.10, 1,539.80 and 643.66 is: 888.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.10 : 1,539.80 = 643.66 : x
  2. Step 2: Convert to fraction form
    1,116.10/1,539.80 = 643.66/x
  3. Step 3: Cross multiply
    1,116.10x = 1,539.80 × 643.66
  4. Step 4: Simplify right side
    1,116.10x = 991,107.67
  5. Step 5: Solve for x
    x = 991,107.67/1,116.10
  6. Step 6: Final answer
    x = 888.01

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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.