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Finding the Fourth Proportional to 15,651.98, 21,599.72 and 8,578.40

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Solution

The fourth proportional to 15,651.98, 21,599.72 and 8,578.40 is: 11,838.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,651.98 : 21,599.72 = 8,578.40 : x
  2. Step 2: Convert to fraction form
    15,651.98/21,599.72 = 8,578.40/x
  3. Step 3: Cross multiply
    15,651.98x = 21,599.72 × 8,578.40
  4. Step 4: Simplify right side
    15,651.98x = 185,291,038.05
  5. Step 5: Solve for x
    x = 185,291,038.05/15,651.98
  6. Step 6: Final answer
    x = 11,838.19

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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.