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Finding the Fourth Proportional to 128,719.20, 193,208.40 and 62,212.80

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Solution

The fourth proportional to 128,719.20, 193,208.40 and 62,212.80 is: 93,381.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,719.20 : 193,208.40 = 62,212.80 : x
  2. Step 2: Convert to fraction form
    128,719.20/193,208.40 = 62,212.80/x
  3. Step 3: Cross multiply
    128,719.20x = 193,208.40 × 62,212.80
  4. Step 4: Simplify right side
    128,719.20x = 12,020,035,547.52
  5. Step 5: Solve for x
    x = 12,020,035,547.52/128,719.20
  6. Step 6: Final answer
    x = 93,381.84

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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.