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Finding the Fourth Proportional to 15,888.61, 21,901.21 and 12,099.70

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Solution

The fourth proportional to 15,888.61, 21,901.21 and 12,099.70 is: 16,678.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,888.61 : 21,901.21 = 12,099.70 : x
  2. Step 2: Convert to fraction form
    15,888.61/21,901.21 = 12,099.70/x
  3. Step 3: Cross multiply
    15,888.61x = 21,901.21 × 12,099.70
  4. Step 4: Simplify right side
    15,888.61x = 264,998,070.64
  5. Step 5: Solve for x
    x = 264,998,070.64/15,888.61
  6. Step 6: Final answer
    x = 16,678.49

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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.