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Finding the Fourth Proportional to 28,104.76, 38,784.72 and 15,529.51

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Solution

The fourth proportional to 28,104.76, 38,784.72 and 15,529.51 is: 21,430.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,104.76 : 38,784.72 = 15,529.51 : x
  2. Step 2: Convert to fraction form
    28,104.76/38,784.72 = 15,529.51/x
  3. Step 3: Cross multiply
    28,104.76x = 38,784.72 × 15,529.51
  4. Step 4: Simplify right side
    28,104.76x = 602,307,697.09
  5. Step 5: Solve for x
    x = 602,307,697.09/28,104.76
  6. Step 6: Final answer
    x = 21,430.81

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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.