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Finding the Fourth Proportional to 1,564.08, 2,342.91 and 781.74

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Solution

The fourth proportional to 1,564.08, 2,342.91 and 781.74 is: 1,171.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,564.08 : 2,342.91 = 781.74 : x
  2. Step 2: Convert to fraction form
    1,564.08/2,342.91 = 781.74/x
  3. Step 3: Cross multiply
    1,564.08x = 2,342.91 × 781.74
  4. Step 4: Simplify right side
    1,564.08x = 1,831,546.46
  5. Step 5: Solve for x
    x = 1,831,546.46/1,564.08
  6. Step 6: Final answer
    x = 1,171.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.