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Finding the Fourth Proportional to 28,970.48, 39,986.04 and 18,881.48

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Solution

The fourth proportional to 28,970.48, 39,986.04 and 18,881.48 is: 26,060.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,970.48 : 39,986.04 = 18,881.48 : x
  2. Step 2: Convert to fraction form
    28,970.48/39,986.04 = 18,881.48/x
  3. Step 3: Cross multiply
    28,970.48x = 39,986.04 × 18,881.48
  4. Step 4: Simplify right side
    28,970.48x = 754,995,614.54
  5. Step 5: Solve for x
    x = 754,995,614.54/28,970.48
  6. Step 6: Final answer
    x = 26,060.86

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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.