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Finding the Fourth Proportional to 768,145.65, 1,076,978.55 and 768,145.65

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Solution

The fourth proportional to 768,145.65, 1,076,978.55 and 768,145.65 is: 1,076,978.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    768,145.65 : 1,076,978.55 = 768,145.65 : x
  2. Step 2: Convert to fraction form
    768,145.65/1,076,978.55 = 768,145.65/x
  3. Step 3: Cross multiply
    768,145.65x = 1,076,978.55 × 768,145.65
  4. Step 4: Simplify right side
    768,145.65x = 827,276,388,325.81
  5. Step 5: Solve for x
    x = 827,276,388,325.81/768,145.65
  6. Step 6: Final answer
    x = 1,076,978.55

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.