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Finding the Fourth Proportional to 973.25, 1,343.84 and 642.15

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Solution

The fourth proportional to 973.25, 1,343.84 and 642.15 is: 886.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.25 : 1,343.84 = 642.15 : x
  2. Step 2: Convert to fraction form
    973.25/1,343.84 = 642.15/x
  3. Step 3: Cross multiply
    973.25x = 1,343.84 × 642.15
  4. Step 4: Simplify right side
    973.25x = 862,943.65
  5. Step 5: Solve for x
    x = 862,943.65/973.25
  6. Step 6: Final answer
    x = 886.66

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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.