Home / 1,318.09-1,819.35-820.48

Finding the Fourth Proportional to 1,318.09, 1,819.35 and 820.48

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Solution

The fourth proportional to 1,318.09, 1,819.35 and 820.48 is: 1,132.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.09 : 1,819.35 = 820.48 : x
  2. Step 2: Convert to fraction form
    1,318.09/1,819.35 = 820.48/x
  3. Step 3: Cross multiply
    1,318.09x = 1,819.35 × 820.48
  4. Step 4: Simplify right side
    1,318.09x = 1,492,740.29
  5. Step 5: Solve for x
    x = 1,492,740.29/1,318.09
  6. Step 6: Final answer
    x = 1,132.50

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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.