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Finding the Fourth Proportional to 91,140.48, 125,830.84 and 69,878.88

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Solution

The fourth proportional to 91,140.48, 125,830.84 and 69,878.88 is: 96,476.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,140.48 : 125,830.84 = 69,878.88 : x
  2. Step 2: Convert to fraction form
    91,140.48/125,830.84 = 69,878.88/x
  3. Step 3: Cross multiply
    91,140.48x = 125,830.84 × 69,878.88
  4. Step 4: Simplify right side
    91,140.48x = 8,792,918,168.66
  5. Step 5: Solve for x
    x = 8,792,918,168.66/91,140.48
  6. Step 6: Final answer
    x = 96,476.54

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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.