Home / 91,140.54-125,738.88-57,089.76

Finding the Fourth Proportional to 91,140.54, 125,738.88 and 57,089.76

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Solution

The fourth proportional to 91,140.54, 125,738.88 and 57,089.76 is: 78,761.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,140.54 : 125,738.88 = 57,089.76 : x
  2. Step 2: Convert to fraction form
    91,140.54/125,738.88 = 57,089.76/x
  3. Step 3: Cross multiply
    91,140.54x = 125,738.88 × 57,089.76
  4. Step 4: Simplify right side
    91,140.54x = 7,178,402,824.67
  5. Step 5: Solve for x
    x = 7,178,402,824.67/91,140.54
  6. Step 6: Final answer
    x = 78,761.91

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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.