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Finding the Fourth Proportional to 900.89, 1,244.40 and 665.32

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Solution

The fourth proportional to 900.89, 1,244.40 and 665.32 is: 919.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.89 : 1,244.40 = 665.32 : x
  2. Step 2: Convert to fraction form
    900.89/1,244.40 = 665.32/x
  3. Step 3: Cross multiply
    900.89x = 1,244.40 × 665.32
  4. Step 4: Simplify right side
    900.89x = 827,924.21
  5. Step 5: Solve for x
    x = 827,924.21/900.89
  6. Step 6: Final answer
    x = 919.01

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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.