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Finding the Fourth Proportional to 61,438.78, 92,174.29 and 19,317.16

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Solution

The fourth proportional to 61,438.78, 92,174.29 and 19,317.16 is: 28,980.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,438.78 : 92,174.29 = 19,317.16 : x
  2. Step 2: Convert to fraction form
    61,438.78/92,174.29 = 19,317.16/x
  3. Step 3: Cross multiply
    61,438.78x = 92,174.29 × 19,317.16
  4. Step 4: Simplify right side
    61,438.78x = 1,780,545,507.82
  5. Step 5: Solve for x
    x = 1,780,545,507.82/61,438.78
  6. Step 6: Final answer
    x = 28,980.81

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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.