Home / 85,426.30-128,139.45-61,806.70

Finding the Fourth Proportional to 85,426.30, 128,139.45 and 61,806.70

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Solution

The fourth proportional to 85,426.30, 128,139.45 and 61,806.70 is: 92,710.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,426.30 : 128,139.45 = 61,806.70 : x
  2. Step 2: Convert to fraction form
    85,426.30/128,139.45 = 61,806.70/x
  3. Step 3: Cross multiply
    85,426.30x = 128,139.45 × 61,806.70
  4. Step 4: Simplify right side
    85,426.30x = 7,919,876,544.32
  5. Step 5: Solve for x
    x = 7,919,876,544.32/85,426.30
  6. Step 6: Final answer
    x = 92,710.05

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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.