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Finding the Fourth Proportional to 901.89, 1,245.78 and 666.32

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Solution

The fourth proportional to 901.89, 1,245.78 and 666.32 is: 920.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.89 : 1,245.78 = 666.32 : x
  2. Step 2: Convert to fraction form
    901.89/1,245.78 = 666.32/x
  3. Step 3: Cross multiply
    901.89x = 1,245.78 × 666.32
  4. Step 4: Simplify right side
    901.89x = 830,081.90
  5. Step 5: Solve for x
    x = 830,081.90/901.89
  6. Step 6: Final answer
    x = 920.38

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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.