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Finding the Fourth Proportional to 990.35, 1,485.51 and 297

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Solution

The fourth proportional to 990.35, 1,485.51 and 297 is: 445.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.35 : 1,485.51 = 297 : x
  2. Step 2: Convert to fraction form
    990.35/1,485.51 = 297/x
  3. Step 3: Cross multiply
    990.35x = 1,485.51 × 297
  4. Step 4: Simplify right side
    990.35x = 441,196.47
  5. Step 5: Solve for x
    x = 441,196.47/990.35
  6. Step 6: Final answer
    x = 445.50

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Double scale
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Similar ratio
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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.