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Finding the Fourth Proportional to 1,945.64, 2,918.51 and 647.21

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Solution

The fourth proportional to 1,945.64, 2,918.51 and 647.21 is: 970.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,945.64 : 2,918.51 = 647.21 : x
  2. Step 2: Convert to fraction form
    1,945.64/2,918.51 = 647.21/x
  3. Step 3: Cross multiply
    1,945.64x = 2,918.51 × 647.21
  4. Step 4: Simplify right side
    1,945.64x = 1,888,888.86
  5. Step 5: Solve for x
    x = 1,888,888.86/1,945.64
  6. Step 6: Final answer
    x = 970.83

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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.