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Finding the Fourth Proportional to 137,904.90, 206,710.20 and 78,612.90

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Solution

The fourth proportional to 137,904.90, 206,710.20 and 78,612.90 is: 117,835.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,904.90 : 206,710.20 = 78,612.90 : x
  2. Step 2: Convert to fraction form
    137,904.90/206,710.20 = 78,612.90/x
  3. Step 3: Cross multiply
    137,904.90x = 206,710.20 × 78,612.90
  4. Step 4: Simplify right side
    137,904.90x = 16,250,088,281.58
  5. Step 5: Solve for x
    x = 16,250,088,281.58/137,904.90
  6. Step 6: Final answer
    x = 117,835.47

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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.