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Finding the Fourth Proportional to 70,919.61, 106,379.76 and 21,000.65

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Solution

The fourth proportional to 70,919.61, 106,379.76 and 21,000.65 is: 31,501.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,919.61 : 106,379.76 = 21,000.65 : x
  2. Step 2: Convert to fraction form
    70,919.61/106,379.76 = 21,000.65/x
  3. Step 3: Cross multiply
    70,919.61x = 106,379.76 × 21,000.65
  4. Step 4: Simplify right side
    70,919.61x = 2,234,044,106.84
  5. Step 5: Solve for x
    x = 2,234,044,106.84/70,919.61
  6. Step 6: Final answer
    x = 31,501.08

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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.