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Finding the Fourth Proportional to 19,603.80, 29,412.90 and 7,918.20

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Solution

The fourth proportional to 19,603.80, 29,412.90 and 7,918.20 is: 11,880.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,603.80 : 29,412.90 = 7,918.20 : x
  2. Step 2: Convert to fraction form
    19,603.80/29,412.90 = 7,918.20/x
  3. Step 3: Cross multiply
    19,603.80x = 29,412.90 × 7,918.20
  4. Step 4: Simplify right side
    19,603.80x = 232,897,224.78
  5. Step 5: Solve for x
    x = 232,897,224.78/19,603.80
  6. Step 6: Final answer
    x = 11,880.21

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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.