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Finding the Fourth Proportional to 28,602.72, 39,428 and 20,080.93

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Solution

The fourth proportional to 28,602.72, 39,428 and 20,080.93 is: 27,680.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,602.72 : 39,428 = 20,080.93 : x
  2. Step 2: Convert to fraction form
    28,602.72/39,428 = 20,080.93/x
  3. Step 3: Cross multiply
    28,602.72x = 39,428 × 20,080.93
  4. Step 4: Simplify right side
    28,602.72x = 791,750,908.04
  5. Step 5: Solve for x
    x = 791,750,908.04/28,602.72
  6. Step 6: Final answer
    x = 27,680.97

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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.