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Finding the Fourth Proportional to 12,861.61, 19,279.64 and 7,303.45

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Solution

The fourth proportional to 12,861.61, 19,279.64 and 7,303.45 is: 10,947.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,861.61 : 19,279.64 = 7,303.45 : x
  2. Step 2: Convert to fraction form
    12,861.61/19,279.64 = 7,303.45/x
  3. Step 3: Cross multiply
    12,861.61x = 19,279.64 × 7,303.45
  4. Step 4: Simplify right side
    12,861.61x = 140,807,753.84
  5. Step 5: Solve for x
    x = 140,807,753.84/12,861.61
  6. Step 6: Final answer
    x = 10,947.91

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1.5x scale

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.