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Finding the Fourth Proportional to 158,643.07, 218,926.06 and 87,021.79

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Solution

The fourth proportional to 158,643.07, 218,926.06 and 87,021.79 is: 120,089.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,643.07 : 218,926.06 = 87,021.79 : x
  2. Step 2: Convert to fraction form
    158,643.07/218,926.06 = 87,021.79/x
  3. Step 3: Cross multiply
    158,643.07x = 218,926.06 × 87,021.79
  4. Step 4: Simplify right side
    158,643.07x = 19,051,337,618.85
  5. Step 5: Solve for x
    x = 19,051,337,618.85/158,643.07
  6. Step 6: Final answer
    x = 120,089.32

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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.