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Finding the Fourth Proportional to 77,078, 115,617 and 18,710

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Solution

The fourth proportional to 77,078, 115,617 and 18,710 is: 28,065

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,078 : 115,617 = 18,710 : x
  2. Step 2: Convert to fraction form
    77,078/115,617 = 18,710/x
  3. Step 3: Cross multiply
    77,078x = 115,617 × 18,710
  4. Step 4: Simplify right side
    77,078x = 2,163,194,070
  5. Step 5: Solve for x
    x = 2,163,194,070/77,078
  6. Step 6: Final answer
    x = 28,065

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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.