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Finding the Fourth Proportional to 8,957, 12,360.78 and 5,420.60

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Solution

The fourth proportional to 8,957, 12,360.78 and 5,420.60 is: 7,480.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,957 : 12,360.78 = 5,420.60 : x
  2. Step 2: Convert to fraction form
    8,957/12,360.78 = 5,420.60/x
  3. Step 3: Cross multiply
    8,957x = 12,360.78 × 5,420.60
  4. Step 4: Simplify right side
    8,957x = 67,002,844.07
  5. Step 5: Solve for x
    x = 67,002,844.07/8,957
  6. Step 6: Final answer
    x = 7,480.50

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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.