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Finding the Fourth Proportional to 28,602.15, 42,929.79 and 20,605.20

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Solution

The fourth proportional to 28,602.15, 42,929.79 and 20,605.20 is: 30,926.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,602.15 : 42,929.79 = 20,605.20 : x
  2. Step 2: Convert to fraction form
    28,602.15/42,929.79 = 20,605.20/x
  3. Step 3: Cross multiply
    28,602.15x = 42,929.79 × 20,605.20
  4. Step 4: Simplify right side
    28,602.15x = 884,576,908.91
  5. Step 5: Solve for x
    x = 884,576,908.91/28,602.15
  6. Step 6: Final answer
    x = 30,926.94

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1.5x scale

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.