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Finding the Fourth Proportional to 972.38, 1,342.10 and 640.84

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Solution

The fourth proportional to 972.38, 1,342.10 and 640.84 is: 884.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.38 : 1,342.10 = 640.84 : x
  2. Step 2: Convert to fraction form
    972.38/1,342.10 = 640.84/x
  3. Step 3: Cross multiply
    972.38x = 1,342.10 × 640.84
  4. Step 4: Simplify right side
    972.38x = 860,071.36
  5. Step 5: Solve for x
    x = 860,071.36/972.38
  6. Step 6: Final answer
    x = 884.50

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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.