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Finding the Fourth Proportional to 972.19, 1,342.36 and 641.08

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Solution

The fourth proportional to 972.19, 1,342.36 and 641.08 is: 885.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.19 : 1,342.36 = 641.08 : x
  2. Step 2: Convert to fraction form
    972.19/1,342.36 = 641.08/x
  3. Step 3: Cross multiply
    972.19x = 1,342.36 × 641.08
  4. Step 4: Simplify right side
    972.19x = 860,560.15
  5. Step 5: Solve for x
    x = 860,560.15/972.19
  6. Step 6: Final answer
    x = 885.18

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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.