Home / 2,638.40-3,951.20-1,985.60

Finding the Fourth Proportional to 2,638.40, 3,951.20 and 1,985.60

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Solution

The fourth proportional to 2,638.40, 3,951.20 and 1,985.60 is: 2,973.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,638.40 : 3,951.20 = 1,985.60 : x
  2. Step 2: Convert to fraction form
    2,638.40/3,951.20 = 1,985.60/x
  3. Step 3: Cross multiply
    2,638.40x = 3,951.20 × 1,985.60
  4. Step 4: Simplify right side
    2,638.40x = 7,845,502.72
  5. Step 5: Solve for x
    x = 7,845,502.72/2,638.40
  6. Step 6: Final answer
    x = 2,973.58

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1.5x scale

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.