Home / 3,129.78-4,318.25-1,870.28

Finding the Fourth Proportional to 3,129.78, 4,318.25 and 1,870.28

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Solution

The fourth proportional to 3,129.78, 4,318.25 and 1,870.28 is: 2,580.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,129.78 : 4,318.25 = 1,870.28 : x
  2. Step 2: Convert to fraction form
    3,129.78/4,318.25 = 1,870.28/x
  3. Step 3: Cross multiply
    3,129.78x = 4,318.25 × 1,870.28
  4. Step 4: Simplify right side
    3,129.78x = 8,076,336.61
  5. Step 5: Solve for x
    x = 8,076,336.61/3,129.78
  6. Step 6: Final answer
    x = 2,580.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.