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Finding the Fourth Proportional to 28,490.54, 42,743.70 and 11,858.40

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Solution

The fourth proportional to 28,490.54, 42,743.70 and 11,858.40 is: 17,790.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,490.54 : 42,743.70 = 11,858.40 : x
  2. Step 2: Convert to fraction form
    28,490.54/42,743.70 = 11,858.40/x
  3. Step 3: Cross multiply
    28,490.54x = 42,743.70 × 11,858.40
  4. Step 4: Simplify right side
    28,490.54x = 506,871,892.08
  5. Step 5: Solve for x
    x = 506,871,892.08/28,490.54
  6. Step 6: Final answer
    x = 17,790.89

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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.