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Finding the Fourth Proportional to 12,887.60, 19,430.81 and 12,807.64

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Solution

The fourth proportional to 12,887.60, 19,430.81 and 12,807.64 is: 19,310.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,887.60 : 19,430.81 = 12,807.64 : x
  2. Step 2: Convert to fraction form
    12,887.60/19,430.81 = 12,807.64/x
  3. Step 3: Cross multiply
    12,887.60x = 19,430.81 × 12,807.64
  4. Step 4: Simplify right side
    12,887.60x = 248,862,819.39
  5. Step 5: Solve for x
    x = 248,862,819.39/12,887.60
  6. Step 6: Final answer
    x = 19,310.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.