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Finding the Fourth Proportional to 28,638.65, 42,940.65 and 12,840.75

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Solution

The fourth proportional to 28,638.65, 42,940.65 and 12,840.75 is: 19,253.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,638.65 : 42,940.65 = 12,840.75 : x
  2. Step 2: Convert to fraction form
    28,638.65/42,940.65 = 12,840.75/x
  3. Step 3: Cross multiply
    28,638.65x = 42,940.65 × 12,840.75
  4. Step 4: Simplify right side
    28,638.65x = 551,390,151.49
  5. Step 5: Solve for x
    x = 551,390,151.49/28,638.65
  6. Step 6: Final answer
    x = 19,253.36

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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.