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Finding the Fourth Proportional to 18,896.40, 28,312.20 and 12,319.20

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Solution

The fourth proportional to 18,896.40, 28,312.20 and 12,319.20 is: 18,457.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,896.40 : 28,312.20 = 12,319.20 : x
  2. Step 2: Convert to fraction form
    18,896.40/28,312.20 = 12,319.20/x
  3. Step 3: Cross multiply
    18,896.40x = 28,312.20 × 12,319.20
  4. Step 4: Simplify right side
    18,896.40x = 348,783,654.24
  5. Step 5: Solve for x
    x = 348,783,654.24/18,896.40
  6. Step 6: Final answer
    x = 18,457.68

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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.