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Finding the Fourth Proportional to 928,860.21, 1,280,855.43 and 687,648.69

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Solution

The fourth proportional to 928,860.21, 1,280,855.43 and 687,648.69 is: 948,235.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    928,860.21 : 1,280,855.43 = 687,648.69 : x
  2. Step 2: Convert to fraction form
    928,860.21/1,280,855.43 = 687,648.69/x
  3. Step 3: Cross multiply
    928,860.21x = 1,280,855.43 × 687,648.69
  4. Step 4: Simplify right side
    928,860.21x = 880,778,558,518.89
  5. Step 5: Solve for x
    x = 880,778,558,518.89/928,860.21
  6. Step 6: Final answer
    x = 948,235.86

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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.