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Finding the Fourth Proportional to 918.96, 1,268.76 and 608.64

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Solution

The fourth proportional to 918.96, 1,268.76 and 608.64 is: 840.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.96 : 1,268.76 = 608.64 : x
  2. Step 2: Convert to fraction form
    918.96/1,268.76 = 608.64/x
  3. Step 3: Cross multiply
    918.96x = 1,268.76 × 608.64
  4. Step 4: Simplify right side
    918.96x = 772,218.09
  5. Step 5: Solve for x
    x = 772,218.09/918.96
  6. Step 6: Final answer
    x = 840.32

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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.