Home / 1,280.10-1,919.86-500.12

Finding the Fourth Proportional to 1,280.10, 1,919.86 and 500.12

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Solution

The fourth proportional to 1,280.10, 1,919.86 and 500.12 is: 750.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.10 : 1,919.86 = 500.12 : x
  2. Step 2: Convert to fraction form
    1,280.10/1,919.86 = 500.12/x
  3. Step 3: Cross multiply
    1,280.10x = 1,919.86 × 500.12
  4. Step 4: Simplify right side
    1,280.10x = 960,160.38
  5. Step 5: Solve for x
    x = 960,160.38/1,280.10
  6. Step 6: Final answer
    x = 750.07

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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.