Home / 30,886.21-42,619.16-21,930.45

Finding the Fourth Proportional to 30,886.21, 42,619.16 and 21,930.45

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Solution

The fourth proportional to 30,886.21, 42,619.16 and 21,930.45 is: 30,261.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,886.21 : 42,619.16 = 21,930.45 : x
  2. Step 2: Convert to fraction form
    30,886.21/42,619.16 = 21,930.45/x
  3. Step 3: Cross multiply
    30,886.21x = 42,619.16 × 21,930.45
  4. Step 4: Simplify right side
    30,886.21x = 934,657,252.43
  5. Step 5: Solve for x
    x = 934,657,252.43/30,886.21
  6. Step 6: Final answer
    x = 30,261.31

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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.