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Finding the Fourth Proportional to 142,092.80, 213,139.20 and 99,699.20

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Solution

The fourth proportional to 142,092.80, 213,139.20 and 99,699.20 is: 149,548.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,092.80 : 213,139.20 = 99,699.20 : x
  2. Step 2: Convert to fraction form
    142,092.80/213,139.20 = 99,699.20/x
  3. Step 3: Cross multiply
    142,092.80x = 213,139.20 × 99,699.20
  4. Step 4: Simplify right side
    142,092.80x = 21,249,807,728.64
  5. Step 5: Solve for x
    x = 21,249,807,728.64/142,092.80
  6. Step 6: Final answer
    x = 149,548.80

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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.