Home / 9,078.40-12,531.20-5,721.60

Finding the Fourth Proportional to 9,078.40, 12,531.20 and 5,721.60

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Solution

The fourth proportional to 9,078.40, 12,531.20 and 5,721.60 is: 7,897.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,078.40 : 12,531.20 = 5,721.60 : x
  2. Step 2: Convert to fraction form
    9,078.40/12,531.20 = 5,721.60/x
  3. Step 3: Cross multiply
    9,078.40x = 12,531.20 × 5,721.60
  4. Step 4: Simplify right side
    9,078.40x = 71,698,513.92
  5. Step 5: Solve for x
    x = 71,698,513.92/9,078.40
  6. Step 6: Final answer
    x = 7,897.70

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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.