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Finding the Fourth Proportional to 1,648.94, 2,275.48 and 985.64

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Solution

The fourth proportional to 1,648.94, 2,275.48 and 985.64 is: 1,360.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,648.94 : 2,275.48 = 985.64 : x
  2. Step 2: Convert to fraction form
    1,648.94/2,275.48 = 985.64/x
  3. Step 3: Cross multiply
    1,648.94x = 2,275.48 × 985.64
  4. Step 4: Simplify right side
    1,648.94x = 2,242,804.11
  5. Step 5: Solve for x
    x = 2,242,804.11/1,648.94
  6. Step 6: Final answer
    x = 1,360.15

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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.