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Finding the Fourth Proportional to 352,006.40, 528,009.60 and 85,764.80

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Solution

The fourth proportional to 352,006.40, 528,009.60 and 85,764.80 is: 128,647.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    352,006.40 : 528,009.60 = 85,764.80 : x
  2. Step 2: Convert to fraction form
    352,006.40/528,009.60 = 85,764.80/x
  3. Step 3: Cross multiply
    352,006.40x = 528,009.60 × 85,764.80
  4. Step 4: Simplify right side
    352,006.40x = 45,284,637,742.08
  5. Step 5: Solve for x
    x = 45,284,637,742.08/352,006.40
  6. Step 6: Final answer
    x = 128,647.20

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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.