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Finding the Fourth Proportional to 2,920.68, 4,031.64 and 1,742.40

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Solution

The fourth proportional to 2,920.68, 4,031.64 and 1,742.40 is: 2,405.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920.68 : 4,031.64 = 1,742.40 : x
  2. Step 2: Convert to fraction form
    2,920.68/4,031.64 = 1,742.40/x
  3. Step 3: Cross multiply
    2,920.68x = 4,031.64 × 1,742.40
  4. Step 4: Simplify right side
    2,920.68x = 7,024,729.54
  5. Step 5: Solve for x
    x = 7,024,729.54/2,920.68
  6. Step 6: Final answer
    x = 2,405.17

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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.