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Finding the Fourth Proportional to 111,021, 153,208.98 and 60,720

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Solution

The fourth proportional to 111,021, 153,208.98 and 60,720 is: 83,793.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,021 : 153,208.98 = 60,720 : x
  2. Step 2: Convert to fraction form
    111,021/153,208.98 = 60,720/x
  3. Step 3: Cross multiply
    111,021x = 153,208.98 × 60,720
  4. Step 4: Simplify right side
    111,021x = 9,302,849,265.60
  5. Step 5: Solve for x
    x = 9,302,849,265.60/111,021
  6. Step 6: Final answer
    x = 83,793.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.