Home / 1,288.20-1,778.58-846.84

Finding the Fourth Proportional to 1,288.20, 1,778.58 and 846.84

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Solution

The fourth proportional to 1,288.20, 1,778.58 and 846.84 is: 1,169.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.20 : 1,778.58 = 846.84 : x
  2. Step 2: Convert to fraction form
    1,288.20/1,778.58 = 846.84/x
  3. Step 3: Cross multiply
    1,288.20x = 1,778.58 × 846.84
  4. Step 4: Simplify right side
    1,288.20x = 1,506,172.69
  5. Step 5: Solve for x
    x = 1,506,172.69/1,288.20
  6. Step 6: Final answer
    x = 1,169.21

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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.