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Finding the Fourth Proportional to 780,355.80, 1,076,978.40 and 440,845.92

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Solution

The fourth proportional to 780,355.80, 1,076,978.40 and 440,845.92 is: 608,416.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    780,355.80 : 1,076,978.40 = 440,845.92 : x
  2. Step 2: Convert to fraction form
    780,355.80/1,076,978.40 = 440,845.92/x
  3. Step 3: Cross multiply
    780,355.80x = 1,076,978.40 × 440,845.92
  4. Step 4: Simplify right side
    780,355.80x = 474,781,533,568.13
  5. Step 5: Solve for x
    x = 474,781,533,568.13/780,355.80
  6. Step 6: Final answer
    x = 608,416.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.