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Finding the Fourth Proportional to 1,873.60, 2,809.58 and 640.68

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Solution

The fourth proportional to 1,873.60, 2,809.58 and 640.68 is: 960.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,873.60 : 2,809.58 = 640.68 : x
  2. Step 2: Convert to fraction form
    1,873.60/2,809.58 = 640.68/x
  3. Step 3: Cross multiply
    1,873.60x = 2,809.58 × 640.68
  4. Step 4: Simplify right side
    1,873.60x = 1,800,041.71
  5. Step 5: Solve for x
    x = 1,800,041.71/1,873.60
  6. Step 6: Final answer
    x = 960.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.