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Finding the Fourth Proportional to 28,638.93, 39,510 and 20,663.67

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Solution

The fourth proportional to 28,638.93, 39,510 and 20,663.67 is: 28,507.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,638.93 : 39,510 = 20,663.67 : x
  2. Step 2: Convert to fraction form
    28,638.93/39,510 = 20,663.67/x
  3. Step 3: Cross multiply
    28,638.93x = 39,510 × 20,663.67
  4. Step 4: Simplify right side
    28,638.93x = 816,421,601.70
  5. Step 5: Solve for x
    x = 816,421,601.70/28,638.93
  6. Step 6: Final answer
    x = 28,507.41

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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.