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Finding the Fourth Proportional to 551,603.10, 827,404.65 and 390,639.90

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Solution

The fourth proportional to 551,603.10, 827,404.65 and 390,639.90 is: 585,959.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    551,603.10 : 827,404.65 = 390,639.90 : x
  2. Step 2: Convert to fraction form
    551,603.10/827,404.65 = 390,639.90/x
  3. Step 3: Cross multiply
    551,603.10x = 827,404.65 × 390,639.90
  4. Step 4: Simplify right side
    551,603.10x = 323,217,269,735.54
  5. Step 5: Solve for x
    x = 323,217,269,735.54/551,603.10
  6. Step 6: Final answer
    x = 585,959.85

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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.