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Finding the Fourth Proportional to 982.95, 1,356.75 and 688.29

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Solution

The fourth proportional to 982.95, 1,356.75 and 688.29 is: 950.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.95 : 1,356.75 = 688.29 : x
  2. Step 2: Convert to fraction form
    982.95/1,356.75 = 688.29/x
  3. Step 3: Cross multiply
    982.95x = 1,356.75 × 688.29
  4. Step 4: Simplify right side
    982.95x = 933,837.46
  5. Step 5: Solve for x
    x = 933,837.46/982.95
  6. Step 6: Final answer
    x = 950.04

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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.