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Finding the Fourth Proportional to 627,423.78, 865,878 and 355,544.40

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Solution

The fourth proportional to 627,423.78, 865,878 and 355,544.40 is: 490,670.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    627,423.78 : 865,878 = 355,544.40 : x
  2. Step 2: Convert to fraction form
    627,423.78/865,878 = 355,544.40/x
  3. Step 3: Cross multiply
    627,423.78x = 865,878 × 355,544.40
  4. Step 4: Simplify right side
    627,423.78x = 307,858,073,983.20
  5. Step 5: Solve for x
    x = 307,858,073,983.20/627,423.78
  6. Step 6: Final answer
    x = 490,670.08

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1.5x scale

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.