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Finding the Fourth Proportional to 1,564.39, 2,158.44 and 934.64

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Solution

The fourth proportional to 1,564.39, 2,158.44 and 934.64 is: 1,289.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,564.39 : 2,158.44 = 934.64 : x
  2. Step 2: Convert to fraction form
    1,564.39/2,158.44 = 934.64/x
  3. Step 3: Cross multiply
    1,564.39x = 2,158.44 × 934.64
  4. Step 4: Simplify right side
    1,564.39x = 2,017,359.69
  5. Step 5: Solve for x
    x = 2,017,359.69/1,564.39
  6. Step 6: Final answer
    x = 1,289.55

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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.