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Finding the Fourth Proportional to 143,388.59, 197,878.53 and 78,860.64

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Solution

The fourth proportional to 143,388.59, 197,878.53 and 78,860.64 is: 108,828.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,388.59 : 197,878.53 = 78,860.64 : x
  2. Step 2: Convert to fraction form
    143,388.59/197,878.53 = 78,860.64/x
  3. Step 3: Cross multiply
    143,388.59x = 197,878.53 × 78,860.64
  4. Step 4: Simplify right side
    143,388.59x = 15,604,827,518.06
  5. Step 5: Solve for x
    x = 15,604,827,518.06/143,388.59
  6. Step 6: Final answer
    x = 108,828.94

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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.