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Finding the Fourth Proportional to 28,970.24, 39,978.48 and 15,722.24

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Solution

The fourth proportional to 28,970.24, 39,978.48 and 15,722.24 is: 21,696.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,970.24 : 39,978.48 = 15,722.24 : x
  2. Step 2: Convert to fraction form
    28,970.24/39,978.48 = 15,722.24/x
  3. Step 3: Cross multiply
    28,970.24x = 39,978.48 × 15,722.24
  4. Step 4: Simplify right side
    28,970.24x = 628,551,257.40
  5. Step 5: Solve for x
    x = 628,551,257.40/28,970.24
  6. Step 6: Final answer
    x = 21,696.45

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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.