Home / 103,520.32-142,928.86-79,278.51

Finding the Fourth Proportional to 103,520.32, 142,928.86 and 79,278.51

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Solution

The fourth proportional to 103,520.32, 142,928.86 and 79,278.51 is: 109,458.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,520.32 : 142,928.86 = 79,278.51 : x
  2. Step 2: Convert to fraction form
    103,520.32/142,928.86 = 79,278.51/x
  3. Step 3: Cross multiply
    103,520.32x = 142,928.86 × 79,278.51
  4. Step 4: Simplify right side
    103,520.32x = 11,331,187,056.80
  5. Step 5: Solve for x
    x = 11,331,187,056.80/103,520.32
  6. Step 6: Final answer
    x = 109,458.58

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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.