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Finding the Fourth Proportional to 161,421.40, 242,059.20 and 72,629.20

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Solution

The fourth proportional to 161,421.40, 242,059.20 and 72,629.20 is: 108,911.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    161,421.40 : 242,059.20 = 72,629.20 : x
  2. Step 2: Convert to fraction form
    161,421.40/242,059.20 = 72,629.20/x
  3. Step 3: Cross multiply
    161,421.40x = 242,059.20 × 72,629.20
  4. Step 4: Simplify right side
    161,421.40x = 17,580,566,048.64
  5. Step 5: Solve for x
    x = 17,580,566,048.64/161,421.40
  6. Step 6: Final answer
    x = 108,911.00

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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.