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Finding the Fourth Proportional to 12,946.60, 17,861.70 and 7,638.76

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Solution

The fourth proportional to 12,946.60, 17,861.70 and 7,638.76 is: 10,538.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,946.60 : 17,861.70 = 7,638.76 : x
  2. Step 2: Convert to fraction form
    12,946.60/17,861.70 = 7,638.76/x
  3. Step 3: Cross multiply
    12,946.60x = 17,861.70 × 7,638.76
  4. Step 4: Simplify right side
    12,946.60x = 136,441,239.49
  5. Step 5: Solve for x
    x = 136,441,239.49/12,946.60
  6. Step 6: Final answer
    x = 10,538.77

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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.