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Finding the Fourth Proportional to 38,686.77, 58,051.62 and 20,916.99

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Solution

The fourth proportional to 38,686.77, 58,051.62 and 20,916.99 is: 31,387.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,686.77 : 58,051.62 = 20,916.99 : x
  2. Step 2: Convert to fraction form
    38,686.77/58,051.62 = 20,916.99/x
  3. Step 3: Cross multiply
    38,686.77x = 58,051.62 × 20,916.99
  4. Step 4: Simplify right side
    38,686.77x = 1,214,265,155.02
  5. Step 5: Solve for x
    x = 1,214,265,155.02/38,686.77
  6. Step 6: Final answer
    x = 31,387.09

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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.