Home / 1,535.40-2,118.60-945.90

Finding the Fourth Proportional to 1,535.40, 2,118.60 and 945.90

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Solution

The fourth proportional to 1,535.40, 2,118.60 and 945.90 is: 1,305.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,535.40 : 2,118.60 = 945.90 : x
  2. Step 2: Convert to fraction form
    1,535.40/2,118.60 = 945.90/x
  3. Step 3: Cross multiply
    1,535.40x = 2,118.60 × 945.90
  4. Step 4: Simplify right side
    1,535.40x = 2,003,983.74
  5. Step 5: Solve for x
    x = 2,003,983.74/1,535.40
  6. Step 6: Final answer
    x = 1,305.19

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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.