Home / 13,078.99-18,029.95-9,929.71

Finding the Fourth Proportional to 13,078.99, 18,029.95 and 9,929.71

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Solution

The fourth proportional to 13,078.99, 18,029.95 and 9,929.71 is: 13,688.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,078.99 : 18,029.95 = 9,929.71 : x
  2. Step 2: Convert to fraction form
    13,078.99/18,029.95 = 9,929.71/x
  3. Step 3: Cross multiply
    13,078.99x = 18,029.95 × 9,929.71
  4. Step 4: Simplify right side
    13,078.99x = 179,032,174.81
  5. Step 5: Solve for x
    x = 179,032,174.81/13,078.99
  6. Step 6: Final answer
    x = 13,688.53

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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.