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Finding the Fourth Proportional to 1,938.90, 2,907.45 and 842.70

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Solution

The fourth proportional to 1,938.90, 2,907.45 and 842.70 is: 1,263.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.90 : 2,907.45 = 842.70 : x
  2. Step 2: Convert to fraction form
    1,938.90/2,907.45 = 842.70/x
  3. Step 3: Cross multiply
    1,938.90x = 2,907.45 × 842.70
  4. Step 4: Simplify right side
    1,938.90x = 2,450,108.12
  5. Step 5: Solve for x
    x = 2,450,108.12/1,938.90
  6. Step 6: Final answer
    x = 1,263.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.