Home / 2,101.80-2,902.32-1,317.20

Finding the Fourth Proportional to 2,101.80, 2,902.32 and 1,317.20

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Solution

The fourth proportional to 2,101.80, 2,902.32 and 1,317.20 is: 1,818.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,101.80 : 2,902.32 = 1,317.20 : x
  2. Step 2: Convert to fraction form
    2,101.80/2,902.32 = 1,317.20/x
  3. Step 3: Cross multiply
    2,101.80x = 2,902.32 × 1,317.20
  4. Step 4: Simplify right side
    2,101.80x = 3,822,935.90
  5. Step 5: Solve for x
    x = 3,822,935.90/2,101.80
  6. Step 6: Final answer
    x = 1,818.89

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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.