Home / 2,490.47-3,436.77-1,428.20

Finding the Fourth Proportional to 2,490.47, 3,436.77 and 1,428.20

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Solution

The fourth proportional to 2,490.47, 3,436.77 and 1,428.20 is: 1,970.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,490.47 : 3,436.77 = 1,428.20 : x
  2. Step 2: Convert to fraction form
    2,490.47/3,436.77 = 1,428.20/x
  3. Step 3: Cross multiply
    2,490.47x = 3,436.77 × 1,428.20
  4. Step 4: Simplify right side
    2,490.47x = 4,908,394.91
  5. Step 5: Solve for x
    x = 4,908,394.91/2,490.47
  6. Step 6: Final answer
    x = 1,970.87

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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.