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Finding the Fourth Proportional to 19,990.40, 29,985.60 and 12,603.20

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Solution

The fourth proportional to 19,990.40, 29,985.60 and 12,603.20 is: 18,904.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,990.40 : 29,985.60 = 12,603.20 : x
  2. Step 2: Convert to fraction form
    19,990.40/29,985.60 = 12,603.20/x
  3. Step 3: Cross multiply
    19,990.40x = 29,985.60 × 12,603.20
  4. Step 4: Simplify right side
    19,990.40x = 377,914,513.92
  5. Step 5: Solve for x
    x = 377,914,513.92/19,990.40
  6. Step 6: Final answer
    x = 18,904.80

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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.