Home / 81,030.12-121,599.54-28,439.76

Finding the Fourth Proportional to 81,030.12, 121,599.54 and 28,439.76

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Solution

The fourth proportional to 81,030.12, 121,599.54 and 28,439.76 is: 42,678.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,030.12 : 121,599.54 = 28,439.76 : x
  2. Step 2: Convert to fraction form
    81,030.12/121,599.54 = 28,439.76/x
  3. Step 3: Cross multiply
    81,030.12x = 121,599.54 × 28,439.76
  4. Step 4: Simplify right side
    81,030.12x = 3,458,261,733.71
  5. Step 5: Solve for x
    x = 3,458,261,733.71/81,030.12
  6. Step 6: Final answer
    x = 42,678.72

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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.