Home / 91,389.12-136,980-38,765.76

Finding the Fourth Proportional to 91,389.12, 136,980 and 38,765.76

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Solution

The fourth proportional to 91,389.12, 136,980 and 38,765.76 is: 58,104.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,389.12 : 136,980 = 38,765.76 : x
  2. Step 2: Convert to fraction form
    91,389.12/136,980 = 38,765.76/x
  3. Step 3: Cross multiply
    91,389.12x = 136,980 × 38,765.76
  4. Step 4: Simplify right side
    91,389.12x = 5,310,133,804.80
  5. Step 5: Solve for x
    x = 5,310,133,804.80/91,389.12
  6. Step 6: Final answer
    x = 58,104.66

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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.