Home / 28,905.78-39,889.98-15,657.78

Finding the Fourth Proportional to 28,905.78, 39,889.98 and 15,657.78

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Solution

The fourth proportional to 28,905.78, 39,889.98 and 15,657.78 is: 21,607.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,905.78 : 39,889.98 = 15,657.78 : x
  2. Step 2: Convert to fraction form
    28,905.78/39,889.98 = 15,657.78/x
  3. Step 3: Cross multiply
    28,905.78x = 39,889.98 × 15,657.78
  4. Step 4: Simplify right side
    28,905.78x = 624,588,531.04
  5. Step 5: Solve for x
    x = 624,588,531.04/28,905.78
  6. Step 6: Final answer
    x = 21,607.74

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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.