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Finding the Fourth Proportional to 13,969.71, 19,276.79 and 7,920.23

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Solution

The fourth proportional to 13,969.71, 19,276.79 and 7,920.23 is: 10,929.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,969.71 : 19,276.79 = 7,920.23 : x
  2. Step 2: Convert to fraction form
    13,969.71/19,276.79 = 7,920.23/x
  3. Step 3: Cross multiply
    13,969.71x = 19,276.79 × 7,920.23
  4. Step 4: Simplify right side
    13,969.71x = 152,676,474.48
  5. Step 5: Solve for x
    x = 152,676,474.48/13,969.71
  6. Step 6: Final answer
    x = 10,929.11

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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.