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Finding the Fourth Proportional to 28,615.79, 39,489.05 and 15,868.77

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Solution

The fourth proportional to 28,615.79, 39,489.05 and 15,868.77 is: 21,898.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,615.79 : 39,489.05 = 15,868.77 : x
  2. Step 2: Convert to fraction form
    28,615.79/39,489.05 = 15,868.77/x
  3. Step 3: Cross multiply
    28,615.79x = 39,489.05 × 15,868.77
  4. Step 4: Simplify right side
    28,615.79x = 626,642,651.97
  5. Step 5: Solve for x
    x = 626,642,651.97/28,615.79
  6. Step 6: Final answer
    x = 21,898.49

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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.