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Finding the Fourth Proportional to 28,491.78, 42,722.55 and 14,258.01

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Solution

The fourth proportional to 28,491.78, 42,722.55 and 14,258.01 is: 21,379.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,491.78 : 42,722.55 = 14,258.01 : x
  2. Step 2: Convert to fraction form
    28,491.78/42,722.55 = 14,258.01/x
  3. Step 3: Cross multiply
    28,491.78x = 42,722.55 × 14,258.01
  4. Step 4: Simplify right side
    28,491.78x = 609,138,545.13
  5. Step 5: Solve for x
    x = 609,138,545.13/28,491.78
  6. Step 6: Final answer
    x = 21,379.45

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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.