Home / 137,128.86-189,255.35-76,702.86

Finding the Fourth Proportional to 137,128.86, 189,255.35 and 76,702.86

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Solution

The fourth proportional to 137,128.86, 189,255.35 and 76,702.86 is: 105,859.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,128.86 : 189,255.35 = 76,702.86 : x
  2. Step 2: Convert to fraction form
    137,128.86/189,255.35 = 76,702.86/x
  3. Step 3: Cross multiply
    137,128.86x = 189,255.35 × 76,702.86
  4. Step 4: Simplify right side
    137,128.86x = 14,516,426,807.06
  5. Step 5: Solve for x
    x = 14,516,426,807.06/137,128.86
  6. Step 6: Final answer
    x = 105,859.75

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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.