Home / 1,385.36-2,065.20-1,281.68

Finding the Fourth Proportional to 1,385.36, 2,065.20 and 1,281.68

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Solution

The fourth proportional to 1,385.36, 2,065.20 and 1,281.68 is: 1,910.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.36 : 2,065.20 = 1,281.68 : x
  2. Step 2: Convert to fraction form
    1,385.36/2,065.20 = 1,281.68/x
  3. Step 3: Cross multiply
    1,385.36x = 2,065.20 × 1,281.68
  4. Step 4: Simplify right side
    1,385.36x = 2,646,925.54
  5. Step 5: Solve for x
    x = 2,646,925.54/1,385.36
  6. Step 6: Final answer
    x = 1,910.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.