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Finding the Fourth Proportional to 1,564.40, 2,158.56 and 865.64

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Solution

The fourth proportional to 1,564.40, 2,158.56 and 865.64 is: 1,194.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,564.40 : 2,158.56 = 865.64 : x
  2. Step 2: Convert to fraction form
    1,564.40/2,158.56 = 865.64/x
  3. Step 3: Cross multiply
    1,564.40x = 2,158.56 × 865.64
  4. Step 4: Simplify right side
    1,564.40x = 1,868,535.88
  5. Step 5: Solve for x
    x = 1,868,535.88/1,564.40
  6. Step 6: Final answer
    x = 1,194.41

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1.5x scale

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.