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Finding the Fourth Proportional to 15,788.45, 21,790.88 and 9,415.45

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Solution

The fourth proportional to 15,788.45, 21,790.88 and 9,415.45 is: 12,995.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,788.45 : 21,790.88 = 9,415.45 : x
  2. Step 2: Convert to fraction form
    15,788.45/21,790.88 = 9,415.45/x
  3. Step 3: Cross multiply
    15,788.45x = 21,790.88 × 9,415.45
  4. Step 4: Simplify right side
    15,788.45x = 205,170,941.10
  5. Step 5: Solve for x
    x = 205,170,941.10/15,788.45
  6. Step 6: Final answer
    x = 12,995.00

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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.