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Finding the Fourth Proportional to 1,318.08, 1,819.80 and 846.21

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Solution

The fourth proportional to 1,318.08, 1,819.80 and 846.21 is: 1,168.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.08 : 1,819.80 = 846.21 : x
  2. Step 2: Convert to fraction form
    1,318.08/1,819.80 = 846.21/x
  3. Step 3: Cross multiply
    1,318.08x = 1,819.80 × 846.21
  4. Step 4: Simplify right side
    1,318.08x = 1,539,939.78
  5. Step 5: Solve for x
    x = 1,539,939.78/1,318.08
  6. Step 6: Final answer
    x = 1,168.32

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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.