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Finding the Fourth Proportional to 28,611.60, 42,917.40 and 18,697.20

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Solution

The fourth proportional to 28,611.60, 42,917.40 and 18,697.20 is: 28,045.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,611.60 : 42,917.40 = 18,697.20 : x
  2. Step 2: Convert to fraction form
    28,611.60/42,917.40 = 18,697.20/x
  3. Step 3: Cross multiply
    28,611.60x = 42,917.40 × 18,697.20
  4. Step 4: Simplify right side
    28,611.60x = 802,435,211.28
  5. Step 5: Solve for x
    x = 802,435,211.28/28,611.60
  6. Step 6: Final answer
    x = 28,045.80

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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.