Home / 30,780.21-42,511.73-20,691.16

Finding the Fourth Proportional to 30,780.21, 42,511.73 and 20,691.16

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Solution

The fourth proportional to 30,780.21, 42,511.73 and 20,691.16 is: 28,577.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,780.21 : 42,511.73 = 20,691.16 : x
  2. Step 2: Convert to fraction form
    30,780.21/42,511.73 = 20,691.16/x
  3. Step 3: Cross multiply
    30,780.21x = 42,511.73 × 20,691.16
  4. Step 4: Simplify right side
    30,780.21x = 879,616,797.57
  5. Step 5: Solve for x
    x = 879,616,797.57/30,780.21
  6. Step 6: Final answer
    x = 28,577.35

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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.