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Finding the Fourth Proportional to 30,605.49, 45,907.70 and 8,418.78

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Solution

The fourth proportional to 30,605.49, 45,907.70 and 8,418.78 is: 12,628.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,605.49 : 45,907.70 = 8,418.78 : x
  2. Step 2: Convert to fraction form
    30,605.49/45,907.70 = 8,418.78/x
  3. Step 3: Cross multiply
    30,605.49x = 45,907.70 × 8,418.78
  4. Step 4: Simplify right side
    30,605.49x = 386,486,784.51
  5. Step 5: Solve for x
    x = 386,486,784.51/30,605.49
  6. Step 6: Final answer
    x = 12,628.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.