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Finding the Fourth Proportional to 30,889, 42,607.94 and 18,305.32

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Solution

The fourth proportional to 30,889, 42,607.94 and 18,305.32 is: 25,250.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,889 : 42,607.94 = 18,305.32 : x
  2. Step 2: Convert to fraction form
    30,889/42,607.94 = 18,305.32/x
  3. Step 3: Cross multiply
    30,889x = 42,607.94 × 18,305.32
  4. Step 4: Simplify right side
    30,889x = 779,951,976.24
  5. Step 5: Solve for x
    x = 779,951,976.24/30,889
  6. Step 6: Final answer
    x = 25,250.15

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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.