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Finding the Fourth Proportional to 1,021.62, 1,409.35 and 647.95

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Solution

The fourth proportional to 1,021.62, 1,409.35 and 647.95 is: 893.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.62 : 1,409.35 = 647.95 : x
  2. Step 2: Convert to fraction form
    1,021.62/1,409.35 = 647.95/x
  3. Step 3: Cross multiply
    1,021.62x = 1,409.35 × 647.95
  4. Step 4: Simplify right side
    1,021.62x = 913,190.90
  5. Step 5: Solve for x
    x = 913,190.90/1,021.62
  6. Step 6: Final answer
    x = 893.86

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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.