Home / 1,285.10-1,938.63-1,246.80

Finding the Fourth Proportional to 1,285.10, 1,938.63 and 1,246.80

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Solution

The fourth proportional to 1,285.10, 1,938.63 and 1,246.80 is: 1,880.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.10 : 1,938.63 = 1,246.80 : x
  2. Step 2: Convert to fraction form
    1,285.10/1,938.63 = 1,246.80/x
  3. Step 3: Cross multiply
    1,285.10x = 1,938.63 × 1,246.80
  4. Step 4: Simplify right side
    1,285.10x = 2,417,083.88
  5. Step 5: Solve for x
    x = 2,417,083.88/1,285.10
  6. Step 6: Final answer
    x = 1,880.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.