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Finding the Fourth Proportional to 972.50, 1,341.65 and 641.08

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Solution

The fourth proportional to 972.50, 1,341.65 and 641.08 is: 884.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.50 : 1,341.65 = 641.08 : x
  2. Step 2: Convert to fraction form
    972.50/1,341.65 = 641.08/x
  3. Step 3: Cross multiply
    972.50x = 1,341.65 × 641.08
  4. Step 4: Simplify right side
    972.50x = 860,104.98
  5. Step 5: Solve for x
    x = 860,104.98/972.50
  6. Step 6: Final answer
    x = 884.43

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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.