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Finding the Fourth Proportional to 28,570.60, 42,855.90 and 9,856.00

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Solution

The fourth proportional to 28,570.60, 42,855.90 and 9,856.00 is: 14,784.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,570.60 : 42,855.90 = 9,856.00 : x
  2. Step 2: Convert to fraction form
    28,570.60/42,855.90 = 9,856.00/x
  3. Step 3: Cross multiply
    28,570.60x = 42,855.90 × 9,856.00
  4. Step 4: Simplify right side
    28,570.60x = 422,387,536.12
  5. Step 5: Solve for x
    x = 422,387,536.12/28,570.60
  6. Step 6: Final answer
    x = 14,784.00

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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.