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Finding the Fourth Proportional to 991.44, 1,486.45 and 435.88

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Solution

The fourth proportional to 991.44, 1,486.45 and 435.88 is: 653.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.44 : 1,486.45 = 435.88 : x
  2. Step 2: Convert to fraction form
    991.44/1,486.45 = 435.88/x
  3. Step 3: Cross multiply
    991.44x = 1,486.45 × 435.88
  4. Step 4: Simplify right side
    991.44x = 647,913.83
  5. Step 5: Solve for x
    x = 647,913.83/991.44
  6. Step 6: Final answer
    x = 653.51

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Double scale
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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.