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Finding the Fourth Proportional to 15,703.94, 21,672.96 and 8,990.12

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Solution

The fourth proportional to 15,703.94, 21,672.96 and 8,990.12 is: 12,407.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,703.94 : 21,672.96 = 8,990.12 : x
  2. Step 2: Convert to fraction form
    15,703.94/21,672.96 = 8,990.12/x
  3. Step 3: Cross multiply
    15,703.94x = 21,672.96 × 8,990.12
  4. Step 4: Simplify right side
    15,703.94x = 194,842,511.16
  5. Step 5: Solve for x
    x = 194,842,511.16/15,703.94
  6. Step 6: Final answer
    x = 12,407.24

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Half scale
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Double scale
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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.