Home / 85,867.28-128,880.20-61,876.50

Finding the Fourth Proportional to 85,867.28, 128,880.20 and 61,876.50

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Solution

The fourth proportional to 85,867.28, 128,880.20 and 61,876.50 is: 92,871.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,867.28 : 128,880.20 = 61,876.50 : x
  2. Step 2: Convert to fraction form
    85,867.28/128,880.20 = 61,876.50/x
  3. Step 3: Cross multiply
    85,867.28x = 128,880.20 × 61,876.50
  4. Step 4: Simplify right side
    85,867.28x = 7,974,655,849.99
  5. Step 5: Solve for x
    x = 7,974,655,849.99/85,867.28
  6. Step 6: Final answer
    x = 92,871.88

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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.