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Finding the Fourth Proportional to 19,603.80, 29,408.40 and 7,120.80

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Solution

The fourth proportional to 19,603.80, 29,408.40 and 7,120.80 is: 10,682.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,603.80 : 29,408.40 = 7,120.80 : x
  2. Step 2: Convert to fraction form
    19,603.80/29,408.40 = 7,120.80/x
  3. Step 3: Cross multiply
    19,603.80x = 29,408.40 × 7,120.80
  4. Step 4: Simplify right side
    19,603.80x = 209,411,334.72
  5. Step 5: Solve for x
    x = 209,411,334.72/19,603.80
  6. Step 6: Final answer
    x = 10,682.18

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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.