Home / 138,515.13-191,152.58-78,085.80

Finding the Fourth Proportional to 138,515.13, 191,152.58 and 78,085.80

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Solution

The fourth proportional to 138,515.13, 191,152.58 and 78,085.80 is: 107,759.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,515.13 : 191,152.58 = 78,085.80 : x
  2. Step 2: Convert to fraction form
    138,515.13/191,152.58 = 78,085.80/x
  3. Step 3: Cross multiply
    138,515.13x = 191,152.58 × 78,085.80
  4. Step 4: Simplify right side
    138,515.13x = 14,926,301,740.94
  5. Step 5: Solve for x
    x = 14,926,301,740.94/138,515.13
  6. Step 6: Final answer
    x = 107,759.36

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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.