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Finding the Fourth Proportional to 1,165, 1,607.70 and 641.06

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Solution

The fourth proportional to 1,165, 1,607.70 and 641.06 is: 884.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,165 : 1,607.70 = 641.06 : x
  2. Step 2: Convert to fraction form
    1,165/1,607.70 = 641.06/x
  3. Step 3: Cross multiply
    1,165x = 1,607.70 × 641.06
  4. Step 4: Simplify right side
    1,165x = 1,030,632.16
  5. Step 5: Solve for x
    x = 1,030,632.16/1,165
  6. Step 6: Final answer
    x = 884.66

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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.