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Finding the Fourth Proportional to 1,555.12, 2,145.64 and 965.68

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Solution

The fourth proportional to 1,555.12, 2,145.64 and 965.68 is: 1,332.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.12 : 2,145.64 = 965.68 : x
  2. Step 2: Convert to fraction form
    1,555.12/2,145.64 = 965.68/x
  3. Step 3: Cross multiply
    1,555.12x = 2,145.64 × 965.68
  4. Step 4: Simplify right side
    1,555.12x = 2,072,001.64
  5. Step 5: Solve for x
    x = 2,072,001.64/1,555.12
  6. Step 6: Final answer
    x = 1,332.37

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.