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Finding the Fourth Proportional to 100,692.46, 139,008.99 and 62,978.86

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Solution

The fourth proportional to 100,692.46, 139,008.99 and 62,978.86 is: 86,944.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,692.46 : 139,008.99 = 62,978.86 : x
  2. Step 2: Convert to fraction form
    100,692.46/139,008.99 = 62,978.86/x
  3. Step 3: Cross multiply
    100,692.46x = 139,008.99 × 62,978.86
  4. Step 4: Simplify right side
    100,692.46x = 8,754,627,719.95
  5. Step 5: Solve for x
    x = 8,754,627,719.95/100,692.46
  6. Step 6: Final answer
    x = 86,944.22

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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.