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Finding the Fourth Proportional to 85,363.74, 128,017.94 and 28,422.45

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Solution

The fourth proportional to 85,363.74, 128,017.94 and 28,422.45 is: 42,624.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,363.74 : 128,017.94 = 28,422.45 : x
  2. Step 2: Convert to fraction form
    85,363.74/128,017.94 = 28,422.45/x
  3. Step 3: Cross multiply
    85,363.74x = 128,017.94 × 28,422.45
  4. Step 4: Simplify right side
    85,363.74x = 3,638,583,356.64
  5. Step 5: Solve for x
    x = 3,638,583,356.64/85,363.74
  6. Step 6: Final answer
    x = 42,624.46

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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.