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Finding the Fourth Proportional to 85,556.94, 128,360 and 43,435.32

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Solution

The fourth proportional to 85,556.94, 128,360 and 43,435.32 is: 65,165.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,556.94 : 128,360 = 43,435.32 : x
  2. Step 2: Convert to fraction form
    85,556.94/128,360 = 43,435.32/x
  3. Step 3: Cross multiply
    85,556.94x = 128,360 × 43,435.32
  4. Step 4: Simplify right side
    85,556.94x = 5,575,357,675.20
  5. Step 5: Solve for x
    x = 5,575,357,675.20/85,556.94
  6. Step 6: Final answer
    x = 65,165.46

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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.