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Finding the Fourth Proportional to 101,361.76, 139,878.88 and 56,649.76

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Solution

The fourth proportional to 101,361.76, 139,878.88 and 56,649.76 is: 78,176.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,361.76 : 139,878.88 = 56,649.76 : x
  2. Step 2: Convert to fraction form
    101,361.76/139,878.88 = 56,649.76/x
  3. Step 3: Cross multiply
    101,361.76x = 139,878.88 × 56,649.76
  4. Step 4: Simplify right side
    101,361.76x = 7,924,104,981.07
  5. Step 5: Solve for x
    x = 7,924,104,981.07/101,361.76
  6. Step 6: Final answer
    x = 78,176.47

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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.