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Finding the Fourth Proportional to 680,536.40, 939,131 and 378,730.40

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Solution

The fourth proportional to 680,536.40, 939,131 and 378,730.40 is: 522,642.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,536.40 : 939,131 = 378,730.40 : x
  2. Step 2: Convert to fraction form
    680,536.40/939,131 = 378,730.40/x
  3. Step 3: Cross multiply
    680,536.40x = 939,131 × 378,730.40
  4. Step 4: Simplify right side
    680,536.40x = 355,677,459,282.40
  5. Step 5: Solve for x
    x = 355,677,459,282.40/680,536.40
  6. Step 6: Final answer
    x = 522,642.81

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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.