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Finding the Fourth Proportional to 1,945.71, 2,918.97 and 647.15

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Solution

The fourth proportional to 1,945.71, 2,918.97 and 647.15 is: 970.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,945.71 : 2,918.97 = 647.15 : x
  2. Step 2: Convert to fraction form
    1,945.71/2,918.97 = 647.15/x
  3. Step 3: Cross multiply
    1,945.71x = 2,918.97 × 647.15
  4. Step 4: Simplify right side
    1,945.71x = 1,888,996.84
  5. Step 5: Solve for x
    x = 1,888,996.84/1,945.71
  6. Step 6: Final answer
    x = 970.85

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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.