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Finding the Fourth Proportional to 28,643.60, 42,965.40 and 7,869.20

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Solution

The fourth proportional to 28,643.60, 42,965.40 and 7,869.20 is: 11,803.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,643.60 : 42,965.40 = 7,869.20 : x
  2. Step 2: Convert to fraction form
    28,643.60/42,965.40 = 7,869.20/x
  3. Step 3: Cross multiply
    28,643.60x = 42,965.40 × 7,869.20
  4. Step 4: Simplify right side
    28,643.60x = 338,103,325.68
  5. Step 5: Solve for x
    x = 338,103,325.68/28,643.60
  6. Step 6: Final answer
    x = 11,803.80

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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.