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Finding the Fourth Proportional to 85,875.72, 128,850.66 and 46,460.58

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Solution

The fourth proportional to 85,875.72, 128,850.66 and 46,460.58 is: 69,710.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,875.72 : 128,850.66 = 46,460.58 : x
  2. Step 2: Convert to fraction form
    85,875.72/128,850.66 = 46,460.58/x
  3. Step 3: Cross multiply
    85,875.72x = 128,850.66 × 46,460.58
  4. Step 4: Simplify right side
    85,875.72x = 5,986,476,396.98
  5. Step 5: Solve for x
    x = 5,986,476,396.98/85,875.72
  6. Step 6: Final answer
    x = 69,710.93

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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.