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Finding the Fourth Proportional to 15,193.40, 20,968.74 and 8,905.77

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Solution

The fourth proportional to 15,193.40, 20,968.74 and 8,905.77 is: 12,291.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,193.40 : 20,968.74 = 8,905.77 : x
  2. Step 2: Convert to fraction form
    15,193.40/20,968.74 = 8,905.77/x
  3. Step 3: Cross multiply
    15,193.40x = 20,968.74 × 8,905.77
  4. Step 4: Simplify right side
    15,193.40x = 186,742,775.63
  5. Step 5: Solve for x
    x = 186,742,775.63/15,193.40
  6. Step 6: Final answer
    x = 12,291.05

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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.