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Finding the Fourth Proportional to 28,666.65, 39,558.65 and 15,920.66

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Solution

The fourth proportional to 28,666.65, 39,558.65 and 15,920.66 is: 21,969.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,666.65 : 39,558.65 = 15,920.66 : x
  2. Step 2: Convert to fraction form
    28,666.65/39,558.65 = 15,920.66/x
  3. Step 3: Cross multiply
    28,666.65x = 39,558.65 × 15,920.66
  4. Step 4: Simplify right side
    28,666.65x = 629,799,836.00
  5. Step 5: Solve for x
    x = 629,799,836.00/28,666.65
  6. Step 6: Final answer
    x = 21,969.77

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1.5x scale

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.