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Finding the Fourth Proportional to 77,028.60, 115,661.70 and 42,036.60

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Solution

The fourth proportional to 77,028.60, 115,661.70 and 42,036.60 is: 63,119.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,028.60 : 115,661.70 = 42,036.60 : x
  2. Step 2: Convert to fraction form
    77,028.60/115,661.70 = 42,036.60/x
  3. Step 3: Cross multiply
    77,028.60x = 115,661.70 × 42,036.60
  4. Step 4: Simplify right side
    77,028.60x = 4,862,024,618.22
  5. Step 5: Solve for x
    x = 4,862,024,618.22/77,028.60
  6. Step 6: Final answer
    x = 63,119.73

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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.