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Finding the Fourth Proportional to 72,283.10, 108,315.30 and 61,129.40

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Solution

The fourth proportional to 72,283.10, 108,315.30 and 61,129.40 is: 91,601.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,283.10 : 108,315.30 = 61,129.40 : x
  2. Step 2: Convert to fraction form
    72,283.10/108,315.30 = 61,129.40/x
  3. Step 3: Cross multiply
    72,283.10x = 108,315.30 × 61,129.40
  4. Step 4: Simplify right side
    72,283.10x = 6,621,249,299.82
  5. Step 5: Solve for x
    x = 6,621,249,299.82/72,283.10
  6. Step 6: Final answer
    x = 91,601.62

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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.