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Finding the Fourth Proportional to 85,858.48, 128,156.06 and 79,841.80

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Solution

The fourth proportional to 85,858.48, 128,156.06 and 79,841.80 is: 119,175.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,858.48 : 128,156.06 = 79,841.80 : x
  2. Step 2: Convert to fraction form
    85,858.48/128,156.06 = 79,841.80/x
  3. Step 3: Cross multiply
    85,858.48x = 128,156.06 × 79,841.80
  4. Step 4: Simplify right side
    85,858.48x = 10,232,210,511.31
  5. Step 5: Solve for x
    x = 10,232,210,511.31/85,858.48
  6. Step 6: Final answer
    x = 119,175.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.