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Finding the Fourth Proportional to 255,836.79, 383,756.09 and 78,343.02

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Solution

The fourth proportional to 255,836.79, 383,756.09 and 78,343.02 is: 117,514.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,836.79 : 383,756.09 = 78,343.02 : x
  2. Step 2: Convert to fraction form
    255,836.79/383,756.09 = 78,343.02/x
  3. Step 3: Cross multiply
    255,836.79x = 383,756.09 × 78,343.02
  4. Step 4: Simplify right side
    255,836.79x = 30,064,610,642.28
  5. Step 5: Solve for x
    x = 30,064,610,642.28/255,836.79
  6. Step 6: Final answer
    x = 117,514.81

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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.