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Finding the Fourth Proportional to 15,851.63, 21,875.24 and 8,778.50

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Solution

The fourth proportional to 15,851.63, 21,875.24 and 8,778.50 is: 12,114.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,851.63 : 21,875.24 = 8,778.50 : x
  2. Step 2: Convert to fraction form
    15,851.63/21,875.24 = 8,778.50/x
  3. Step 3: Cross multiply
    15,851.63x = 21,875.24 × 8,778.50
  4. Step 4: Simplify right side
    15,851.63x = 192,031,794.34
  5. Step 5: Solve for x
    x = 192,031,794.34/15,851.63
  6. Step 6: Final answer
    x = 12,114.32

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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.