Home / 28,239.84-38,970-15,665.76

Finding the Fourth Proportional to 28,239.84, 38,970 and 15,665.76

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Solution

The fourth proportional to 28,239.84, 38,970 and 15,665.76 is: 21,618.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,239.84 : 38,970 = 15,665.76 : x
  2. Step 2: Convert to fraction form
    28,239.84/38,970 = 15,665.76/x
  3. Step 3: Cross multiply
    28,239.84x = 38,970 × 15,665.76
  4. Step 4: Simplify right side
    28,239.84x = 610,494,667.20
  5. Step 5: Solve for x
    x = 610,494,667.20/28,239.84
  6. Step 6: Final answer
    x = 21,618.21

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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.