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Finding the Fourth Proportional to 30,578.72, 45,868.16 and 8,392.40

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Solution

The fourth proportional to 30,578.72, 45,868.16 and 8,392.40 is: 12,588.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,578.72 : 45,868.16 = 8,392.40 : x
  2. Step 2: Convert to fraction form
    30,578.72/45,868.16 = 8,392.40/x
  3. Step 3: Cross multiply
    30,578.72x = 45,868.16 × 8,392.40
  4. Step 4: Simplify right side
    30,578.72x = 384,943,945.98
  5. Step 5: Solve for x
    x = 384,943,945.98/30,578.72
  6. Step 6: Final answer
    x = 12,588.62

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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.