Home / 12,929.40-19,403.70-5,143.80

Finding the Fourth Proportional to 12,929.40, 19,403.70 and 5,143.80

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Solution

The fourth proportional to 12,929.40, 19,403.70 and 5,143.80 is: 7,719.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,929.40 : 19,403.70 = 5,143.80 : x
  2. Step 2: Convert to fraction form
    12,929.40/19,403.70 = 5,143.80/x
  3. Step 3: Cross multiply
    12,929.40x = 19,403.70 × 5,143.80
  4. Step 4: Simplify right side
    12,929.40x = 99,808,752.06
  5. Step 5: Solve for x
    x = 99,808,752.06/12,929.40
  6. Step 6: Final answer
    x = 7,719.52

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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.