Home / 2,985.40-4,120.28-1,790.45

Finding the Fourth Proportional to 2,985.40, 4,120.28 and 1,790.45

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Solution

The fourth proportional to 2,985.40, 4,120.28 and 1,790.45 is: 2,471.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,985.40 : 4,120.28 = 1,790.45 : x
  2. Step 2: Convert to fraction form
    2,985.40/4,120.28 = 1,790.45/x
  3. Step 3: Cross multiply
    2,985.40x = 4,120.28 × 1,790.45
  4. Step 4: Simplify right side
    2,985.40x = 7,377,139.20
  5. Step 5: Solve for x
    x = 7,377,139.20/2,985.40
  6. Step 6: Final answer
    x = 2,471.07

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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.