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Finding the Fourth Proportional to 2,922.40, 4,031.40 and 2,124.82

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Solution

The fourth proportional to 2,922.40, 4,031.40 and 2,124.82 is: 2,931.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,922.40 : 4,031.40 = 2,124.82 : x
  2. Step 2: Convert to fraction form
    2,922.40/4,031.40 = 2,124.82/x
  3. Step 3: Cross multiply
    2,922.40x = 4,031.40 × 2,124.82
  4. Step 4: Simplify right side
    2,922.40x = 8,565,999.35
  5. Step 5: Solve for x
    x = 8,565,999.35/2,922.40
  6. Step 6: Final answer
    x = 2,931.15

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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.