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Finding the Fourth Proportional to 992.91, 1,370.52 and 643.53

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Solution

The fourth proportional to 992.91, 1,370.52 and 643.53 is: 888.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.91 : 1,370.52 = 643.53 : x
  2. Step 2: Convert to fraction form
    992.91/1,370.52 = 643.53/x
  3. Step 3: Cross multiply
    992.91x = 1,370.52 × 643.53
  4. Step 4: Simplify right side
    992.91x = 881,970.74
  5. Step 5: Solve for x
    x = 881,970.74/992.91
  6. Step 6: Final answer
    x = 888.27

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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.