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Finding the Fourth Proportional to 100,884.38, 139,230.16 and 56,172.38

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Solution

The fourth proportional to 100,884.38, 139,230.16 and 56,172.38 is: 77,523.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,884.38 : 139,230.16 = 56,172.38 : x
  2. Step 2: Convert to fraction form
    100,884.38/139,230.16 = 56,172.38/x
  3. Step 3: Cross multiply
    100,884.38x = 139,230.16 × 56,172.38
  4. Step 4: Simplify right side
    100,884.38x = 7,820,888,618.40
  5. Step 5: Solve for x
    x = 7,820,888,618.40/100,884.38
  6. Step 6: Final answer
    x = 77,523.29

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1.5x scale

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.