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Finding the Fourth Proportional to 153,385.21, 211,669.89 and 85,400.71

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Solution

The fourth proportional to 153,385.21, 211,669.89 and 85,400.71 is: 117,852.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,385.21 : 211,669.89 = 85,400.71 : x
  2. Step 2: Convert to fraction form
    153,385.21/211,669.89 = 85,400.71/x
  3. Step 3: Cross multiply
    153,385.21x = 211,669.89 × 85,400.71
  4. Step 4: Simplify right side
    153,385.21x = 18,076,758,891.62
  5. Step 5: Solve for x
    x = 18,076,758,891.62/153,385.21
  6. Step 6: Final answer
    x = 117,852.03

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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.