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Finding the Fourth Proportional to 19,187.78, 26,464.98 and 12,811.30

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Solution

The fourth proportional to 19,187.78, 26,464.98 and 12,811.30 is: 17,670.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,187.78 : 26,464.98 = 12,811.30 : x
  2. Step 2: Convert to fraction form
    19,187.78/26,464.98 = 12,811.30/x
  3. Step 3: Cross multiply
    19,187.78x = 26,464.98 × 12,811.30
  4. Step 4: Simplify right side
    19,187.78x = 339,050,929.02
  5. Step 5: Solve for x
    x = 339,050,929.02/19,187.78
  6. Step 6: Final answer
    x = 17,670.15

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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.