Home / 13,715.92-18,928-7,428.28

Finding the Fourth Proportional to 13,715.92, 18,928 and 7,428.28

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Solution

The fourth proportional to 13,715.92, 18,928 and 7,428.28 is: 10,251.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,715.92 : 18,928 = 7,428.28 : x
  2. Step 2: Convert to fraction form
    13,715.92/18,928 = 7,428.28/x
  3. Step 3: Cross multiply
    13,715.92x = 18,928 × 7,428.28
  4. Step 4: Simplify right side
    13,715.92x = 140,602,483.84
  5. Step 5: Solve for x
    x = 140,602,483.84/13,715.92
  6. Step 6: Final answer
    x = 10,251.04

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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.