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Finding the Fourth Proportional to 128,612.76, 192,948.30 and 45,506.76

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Solution

The fourth proportional to 128,612.76, 192,948.30 and 45,506.76 is: 68,270.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,612.76 : 192,948.30 = 45,506.76 : x
  2. Step 2: Convert to fraction form
    128,612.76/192,948.30 = 45,506.76/x
  3. Step 3: Cross multiply
    128,612.76x = 192,948.30 × 45,506.76
  4. Step 4: Simplify right side
    128,612.76x = 8,780,451,980.51
  5. Step 5: Solve for x
    x = 8,780,451,980.51/128,612.76
  6. Step 6: Final answer
    x = 68,270.46

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1.5x scale

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.