Home / 78,431.68-108,236.38-42,621.72

Finding the Fourth Proportional to 78,431.68, 108,236.38 and 42,621.72

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Solution

The fourth proportional to 78,431.68, 108,236.38 and 42,621.72 is: 58,818.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,431.68 : 108,236.38 = 42,621.72 : x
  2. Step 2: Convert to fraction form
    78,431.68/108,236.38 = 42,621.72/x
  3. Step 3: Cross multiply
    78,431.68x = 108,236.38 × 42,621.72
  4. Step 4: Simplify right side
    78,431.68x = 4,613,220,682.17
  5. Step 5: Solve for x
    x = 4,613,220,682.17/78,431.68
  6. Step 6: Final answer
    x = 58,818.33

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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.