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Finding the Fourth Proportional to 12,809.70, 19,218.15 and 5,417.70

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Solution

The fourth proportional to 12,809.70, 19,218.15 and 5,417.70 is: 8,128.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,809.70 : 19,218.15 = 5,417.70 : x
  2. Step 2: Convert to fraction form
    12,809.70/19,218.15 = 5,417.70/x
  3. Step 3: Cross multiply
    12,809.70x = 19,218.15 × 5,417.70
  4. Step 4: Simplify right side
    12,809.70x = 104,118,171.26
  5. Step 5: Solve for x
    x = 104,118,171.26/12,809.70
  6. Step 6: Final answer
    x = 8,128.07

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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.