Home / 28,970.72-39,980.16-18,905.60

Finding the Fourth Proportional to 28,970.72, 39,980.16 and 18,905.60

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Solution

The fourth proportional to 28,970.72, 39,980.16 and 18,905.60 is: 26,090.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,970.72 : 39,980.16 = 18,905.60 : x
  2. Step 2: Convert to fraction form
    28,970.72/39,980.16 = 18,905.60/x
  3. Step 3: Cross multiply
    28,970.72x = 39,980.16 × 18,905.60
  4. Step 4: Simplify right side
    28,970.72x = 755,848,912.90
  5. Step 5: Solve for x
    x = 755,848,912.90/28,970.72
  6. Step 6: Final answer
    x = 26,090.10

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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.