Home / 129,509.23-178,675.33-78,485.15

Finding the Fourth Proportional to 129,509.23, 178,675.33 and 78,485.15

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Solution

The fourth proportional to 129,509.23, 178,675.33 and 78,485.15 is: 108,280.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,509.23 : 178,675.33 = 78,485.15 : x
  2. Step 2: Convert to fraction form
    129,509.23/178,675.33 = 78,485.15/x
  3. Step 3: Cross multiply
    129,509.23x = 178,675.33 × 78,485.15
  4. Step 4: Simplify right side
    129,509.23x = 14,023,358,790.55
  5. Step 5: Solve for x
    x = 14,023,358,790.55/129,509.23
  6. Step 6: Final answer
    x = 108,280.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.