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Finding the Fourth Proportional to 1,296.96, 1,945.14 and 647.55

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Solution

The fourth proportional to 1,296.96, 1,945.14 and 647.55 is: 971.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.96 : 1,945.14 = 647.55 : x
  2. Step 2: Convert to fraction form
    1,296.96/1,945.14 = 647.55/x
  3. Step 3: Cross multiply
    1,296.96x = 1,945.14 × 647.55
  4. Step 4: Simplify right side
    1,296.96x = 1,259,575.41
  5. Step 5: Solve for x
    x = 1,259,575.41/1,296.96
  6. Step 6: Final answer
    x = 971.18

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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.