Home / 30,719.60-42,406.13-20,653.89

Finding the Fourth Proportional to 30,719.60, 42,406.13 and 20,653.89

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Solution

The fourth proportional to 30,719.60, 42,406.13 and 20,653.89 is: 28,511.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,719.60 : 42,406.13 = 20,653.89 : x
  2. Step 2: Convert to fraction form
    30,719.60/42,406.13 = 20,653.89/x
  3. Step 3: Cross multiply
    30,719.60x = 42,406.13 × 20,653.89
  4. Step 4: Simplify right side
    30,719.60x = 875,851,436.96
  5. Step 5: Solve for x
    x = 875,851,436.96/30,719.60
  6. Step 6: Final answer
    x = 28,511.16

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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.