Home / 1,285.78-1,926.80-700.28

Finding the Fourth Proportional to 1,285.78, 1,926.80 and 700.28

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Solution

The fourth proportional to 1,285.78, 1,926.80 and 700.28 is: 1,049.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.78 : 1,926.80 = 700.28 : x
  2. Step 2: Convert to fraction form
    1,285.78/1,926.80 = 700.28/x
  3. Step 3: Cross multiply
    1,285.78x = 1,926.80 × 700.28
  4. Step 4: Simplify right side
    1,285.78x = 1,349,299.50
  5. Step 5: Solve for x
    x = 1,349,299.50/1,285.78
  6. Step 6: Final answer
    x = 1,049.40

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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.