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Finding the Fourth Proportional to 1,062.90, 1,466.45 and 643.09

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Solution

The fourth proportional to 1,062.90, 1,466.45 and 643.09 is: 887.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,062.90 : 1,466.45 = 643.09 : x
  2. Step 2: Convert to fraction form
    1,062.90/1,466.45 = 643.09/x
  3. Step 3: Cross multiply
    1,062.90x = 1,466.45 × 643.09
  4. Step 4: Simplify right side
    1,062.90x = 943,057.16
  5. Step 5: Solve for x
    x = 943,057.16/1,062.90
  6. Step 6: Final answer
    x = 887.25

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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.