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Finding the Fourth Proportional to 485,145.60, 729,030.60 and 427,408.80

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Solution

The fourth proportional to 485,145.60, 729,030.60 and 427,408.80 is: 642,269.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,145.60 : 729,030.60 = 427,408.80 : x
  2. Step 2: Convert to fraction form
    485,145.60/729,030.60 = 427,408.80/x
  3. Step 3: Cross multiply
    485,145.60x = 729,030.60 × 427,408.80
  4. Step 4: Simplify right side
    485,145.60x = 311,594,093,909.28
  5. Step 5: Solve for x
    x = 311,594,093,909.28/485,145.60
  6. Step 6: Final answer
    x = 642,269.24

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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.