Home / 1,688.20-2,326.93-1,128.47

Finding the Fourth Proportional to 1,688.20, 2,326.93 and 1,128.47

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Solution

The fourth proportional to 1,688.20, 2,326.93 and 1,128.47 is: 1,555.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.20 : 2,326.93 = 1,128.47 : x
  2. Step 2: Convert to fraction form
    1,688.20/2,326.93 = 1,128.47/x
  3. Step 3: Cross multiply
    1,688.20x = 2,326.93 × 1,128.47
  4. Step 4: Simplify right side
    1,688.20x = 2,625,873.20
  5. Step 5: Solve for x
    x = 2,625,873.20/1,688.20
  6. Step 6: Final answer
    x = 1,555.42

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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.