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Finding the Fourth Proportional to 638,149, 880,651.40 and 351,679.36

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Solution

The fourth proportional to 638,149, 880,651.40 and 351,679.36 is: 485,320.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,149 : 880,651.40 = 351,679.36 : x
  2. Step 2: Convert to fraction form
    638,149/880,651.40 = 351,679.36/x
  3. Step 3: Cross multiply
    638,149x = 880,651.40 × 351,679.36
  4. Step 4: Simplify right side
    638,149x = 309,706,920,735.10
  5. Step 5: Solve for x
    x = 309,706,920,735.10/638,149
  6. Step 6: Final answer
    x = 485,320.70

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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.