Home / 10,520.78-15,778.40-4,972.64

Finding the Fourth Proportional to 10,520.78, 15,778.40 and 4,972.64

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Solution

The fourth proportional to 10,520.78, 15,778.40 and 4,972.64 is: 7,457.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,520.78 : 15,778.40 = 4,972.64 : x
  2. Step 2: Convert to fraction form
    10,520.78/15,778.40 = 4,972.64/x
  3. Step 3: Cross multiply
    10,520.78x = 15,778.40 × 4,972.64
  4. Step 4: Simplify right side
    10,520.78x = 78,460,302.98
  5. Step 5: Solve for x
    x = 78,460,302.98/10,520.78
  6. Step 6: Final answer
    x = 7,457.65

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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.