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Finding the Fourth Proportional to 18,721.40, 28,090.20 and 9,487.40

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Solution

The fourth proportional to 18,721.40, 28,090.20 and 9,487.40 is: 14,235.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.40 : 28,090.20 = 9,487.40 : x
  2. Step 2: Convert to fraction form
    18,721.40/28,090.20 = 9,487.40/x
  3. Step 3: Cross multiply
    18,721.40x = 28,090.20 × 9,487.40
  4. Step 4: Simplify right side
    18,721.40x = 266,502,963.48
  5. Step 5: Solve for x
    x = 266,502,963.48/18,721.40
  6. Step 6: Final answer
    x = 14,235.20

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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.