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Finding the Fourth Proportional to 983.76, 1,357.20 and 634.38

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Solution

The fourth proportional to 983.76, 1,357.20 and 634.38 is: 875.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.76 : 1,357.20 = 634.38 : x
  2. Step 2: Convert to fraction form
    983.76/1,357.20 = 634.38/x
  3. Step 3: Cross multiply
    983.76x = 1,357.20 × 634.38
  4. Step 4: Simplify right side
    983.76x = 860,980.54
  5. Step 5: Solve for x
    x = 860,980.54/983.76
  6. Step 6: Final answer
    x = 875.19

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1.5x scale

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.