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Finding the Fourth Proportional to 30,970.88, 42,740.16 and 18,226.88

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Solution

The fourth proportional to 30,970.88, 42,740.16 and 18,226.88 is: 25,153.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,970.88 : 42,740.16 = 18,226.88 : x
  2. Step 2: Convert to fraction form
    30,970.88/42,740.16 = 18,226.88/x
  3. Step 3: Cross multiply
    30,970.88x = 42,740.16 × 18,226.88
  4. Step 4: Simplify right side
    30,970.88x = 779,019,767.50
  5. Step 5: Solve for x
    x = 779,019,767.50/30,970.88
  6. Step 6: Final answer
    x = 25,153.30

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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.