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Finding the Fourth Proportional to 1,113.79, 1,536.98 and 641.75

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Solution

The fourth proportional to 1,113.79, 1,536.98 and 641.75 is: 885.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.79 : 1,536.98 = 641.75 : x
  2. Step 2: Convert to fraction form
    1,113.79/1,536.98 = 641.75/x
  3. Step 3: Cross multiply
    1,113.79x = 1,536.98 × 641.75
  4. Step 4: Simplify right side
    1,113.79x = 986,356.92
  5. Step 5: Solve for x
    x = 986,356.92/1,113.79
  6. Step 6: Final answer
    x = 885.59

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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.