Home / 1,390.13-2,084.95-512.59

Finding the Fourth Proportional to 1,390.13, 2,084.95 and 512.59

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Solution

The fourth proportional to 1,390.13, 2,084.95 and 512.59 is: 768.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.13 : 2,084.95 = 512.59 : x
  2. Step 2: Convert to fraction form
    1,390.13/2,084.95 = 512.59/x
  3. Step 3: Cross multiply
    1,390.13x = 2,084.95 × 512.59
  4. Step 4: Simplify right side
    1,390.13x = 1,068,724.52
  5. Step 5: Solve for x
    x = 1,068,724.52/1,390.13
  6. Step 6: Final answer
    x = 768.79

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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.