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Finding the Fourth Proportional to 28,807.60, 43,211.40 and 17,991.40

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Solution

The fourth proportional to 28,807.60, 43,211.40 and 17,991.40 is: 26,987.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,807.60 : 43,211.40 = 17,991.40 : x
  2. Step 2: Convert to fraction form
    28,807.60/43,211.40 = 17,991.40/x
  3. Step 3: Cross multiply
    28,807.60x = 43,211.40 × 17,991.40
  4. Step 4: Simplify right side
    28,807.60x = 777,433,581.96
  5. Step 5: Solve for x
    x = 777,433,581.96/28,807.60
  6. Step 6: Final answer
    x = 26,987.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.