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Finding the Fourth Proportional to 1,164, 1,606.20 and 639.93

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Solution

The fourth proportional to 1,164, 1,606.20 and 639.93 is: 883.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,164 : 1,606.20 = 639.93 : x
  2. Step 2: Convert to fraction form
    1,164/1,606.20 = 639.93/x
  3. Step 3: Cross multiply
    1,164x = 1,606.20 × 639.93
  4. Step 4: Simplify right side
    1,164x = 1,027,855.57
  5. Step 5: Solve for x
    x = 1,027,855.57/1,164
  6. Step 6: Final answer
    x = 883.04

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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.