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Finding the Fourth Proportional to 79,643.07, 109,870.65 and 51,357.87

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Solution

The fourth proportional to 79,643.07, 109,870.65 and 51,357.87 is: 70,850.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,643.07 : 109,870.65 = 51,357.87 : x
  2. Step 2: Convert to fraction form
    79,643.07/109,870.65 = 51,357.87/x
  3. Step 3: Cross multiply
    79,643.07x = 109,870.65 × 51,357.87
  4. Step 4: Simplify right side
    79,643.07x = 5,642,722,559.52
  5. Step 5: Solve for x
    x = 5,642,722,559.52/79,643.07
  6. Step 6: Final answer
    x = 70,850.14

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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.