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Finding the Fourth Proportional to 255,836.76, 383,756.10 and 78,343.08

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Solution

The fourth proportional to 255,836.76, 383,756.10 and 78,343.08 is: 117,514.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,836.76 : 383,756.10 = 78,343.08 : x
  2. Step 2: Convert to fraction form
    255,836.76/383,756.10 = 78,343.08/x
  3. Step 3: Cross multiply
    255,836.76x = 383,756.10 × 78,343.08
  4. Step 4: Simplify right side
    255,836.76x = 30,064,634,842.79
  5. Step 5: Solve for x
    x = 30,064,634,842.79/255,836.76
  6. Step 6: Final answer
    x = 117,514.91

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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.