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Finding the Fourth Proportional to 19,878.40, 29,817.60 and 18,566.20

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Solution

The fourth proportional to 19,878.40, 29,817.60 and 18,566.20 is: 27,849.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,878.40 : 29,817.60 = 18,566.20 : x
  2. Step 2: Convert to fraction form
    19,878.40/29,817.60 = 18,566.20/x
  3. Step 3: Cross multiply
    19,878.40x = 29,817.60 × 18,566.20
  4. Step 4: Simplify right side
    19,878.40x = 553,599,525.12
  5. Step 5: Solve for x
    x = 553,599,525.12/19,878.40
  6. Step 6: Final answer
    x = 27,849.30

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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.