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Finding the Fourth Proportional to 3,918.61, 5,877.87 and 1,970.38

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Solution

The fourth proportional to 3,918.61, 5,877.87 and 1,970.38 is: 2,955.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,918.61 : 5,877.87 = 1,970.38 : x
  2. Step 2: Convert to fraction form
    3,918.61/5,877.87 = 1,970.38/x
  3. Step 3: Cross multiply
    3,918.61x = 5,877.87 × 1,970.38
  4. Step 4: Simplify right side
    3,918.61x = 11,581,637.49
  5. Step 5: Solve for x
    x = 11,581,637.49/3,918.61
  6. Step 6: Final answer
    x = 2,955.55

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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.