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Finding the Fourth Proportional to 973.99, 1,344.30 and 642.43

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Solution

The fourth proportional to 973.99, 1,344.30 and 642.43 is: 886.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.99 : 1,344.30 = 642.43 : x
  2. Step 2: Convert to fraction form
    973.99/1,344.30 = 642.43/x
  3. Step 3: Cross multiply
    973.99x = 1,344.30 × 642.43
  4. Step 4: Simplify right side
    973.99x = 863,618.65
  5. Step 5: Solve for x
    x = 863,618.65/973.99
  6. Step 6: Final answer
    x = 886.68

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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.