Home / 1,688.80-2,338.32-1,656.40

Finding the Fourth Proportional to 1,688.80, 2,338.32 and 1,656.40

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Solution

The fourth proportional to 1,688.80, 2,338.32 and 1,656.40 is: 2,293.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.80 : 2,338.32 = 1,656.40 : x
  2. Step 2: Convert to fraction form
    1,688.80/2,338.32 = 1,656.40/x
  3. Step 3: Cross multiply
    1,688.80x = 2,338.32 × 1,656.40
  4. Step 4: Simplify right side
    1,688.80x = 3,873,193.25
  5. Step 5: Solve for x
    x = 3,873,193.25/1,688.80
  6. Step 6: Final answer
    x = 2,293.46

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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.