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Finding the Fourth Proportional to 85,907.32, 128,923.43 and 64,873.38

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Solution

The fourth proportional to 85,907.32, 128,923.43 and 64,873.38 is: 97,357.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,907.32 : 128,923.43 = 64,873.38 : x
  2. Step 2: Convert to fraction form
    85,907.32/128,923.43 = 64,873.38/x
  3. Step 3: Cross multiply
    85,907.32x = 128,923.43 × 64,873.38
  4. Step 4: Simplify right side
    85,907.32x = 8,363,698,665.29
  5. Step 5: Solve for x
    x = 8,363,698,665.29/85,907.32
  6. Step 6: Final answer
    x = 97,357.23

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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.