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Finding the Fourth Proportional to 13,879.81, 19,153.65 and 7,913.40

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Solution

The fourth proportional to 13,879.81, 19,153.65 and 7,913.40 is: 10,920.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,879.81 : 19,153.65 = 7,913.40 : x
  2. Step 2: Convert to fraction form
    13,879.81/19,153.65 = 7,913.40/x
  3. Step 3: Cross multiply
    13,879.81x = 19,153.65 × 7,913.40
  4. Step 4: Simplify right side
    13,879.81x = 151,570,398.14
  5. Step 5: Solve for x
    x = 151,570,398.14/13,879.81
  6. Step 6: Final answer
    x = 10,920.21

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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.