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Finding the Fourth Proportional to 667,220.49, 920,830.14 and 380,783.43

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Solution

The fourth proportional to 667,220.49, 920,830.14 and 380,783.43 is: 525,518.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,220.49 : 920,830.14 = 380,783.43 : x
  2. Step 2: Convert to fraction form
    667,220.49/920,830.14 = 380,783.43/x
  3. Step 3: Cross multiply
    667,220.49x = 920,830.14 × 380,783.43
  4. Step 4: Simplify right side
    667,220.49x = 350,636,859,156.58
  5. Step 5: Solve for x
    x = 350,636,859,156.58/667,220.49
  6. Step 6: Final answer
    x = 525,518.72

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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.