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Finding the Fourth Proportional to 210,533.80, 315,647.10 and 85,810.60

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Solution

The fourth proportional to 210,533.80, 315,647.10 and 85,810.60 is: 128,653.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,533.80 : 315,647.10 = 85,810.60 : x
  2. Step 2: Convert to fraction form
    210,533.80/315,647.10 = 85,810.60/x
  3. Step 3: Cross multiply
    210,533.80x = 315,647.10 × 85,810.60
  4. Step 4: Simplify right side
    210,533.80x = 27,085,867,039.26
  5. Step 5: Solve for x
    x = 27,085,867,039.26/210,533.80
  6. Step 6: Final answer
    x = 128,653.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.