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Finding the Fourth Proportional to 687,820.90, 949,305.78 and 401,340.28

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Solution

The fourth proportional to 687,820.90, 949,305.78 and 401,340.28 is: 553,915.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,820.90 : 949,305.78 = 401,340.28 : x
  2. Step 2: Convert to fraction form
    687,820.90/949,305.78 = 401,340.28/x
  3. Step 3: Cross multiply
    687,820.90x = 949,305.78 × 401,340.28
  4. Step 4: Simplify right side
    687,820.90x = 380,994,647,550.82
  5. Step 5: Solve for x
    x = 380,994,647,550.82/687,820.90
  6. Step 6: Final answer
    x = 553,915.49

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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.