Home / 1,638.79-2,261.59-975.71

Finding the Fourth Proportional to 1,638.79, 2,261.59 and 975.71

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Solution

The fourth proportional to 1,638.79, 2,261.59 and 975.71 is: 1,346.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.79 : 2,261.59 = 975.71 : x
  2. Step 2: Convert to fraction form
    1,638.79/2,261.59 = 975.71/x
  3. Step 3: Cross multiply
    1,638.79x = 2,261.59 × 975.71
  4. Step 4: Simplify right side
    1,638.79x = 2,206,659.19
  5. Step 5: Solve for x
    x = 2,206,659.19/1,638.79
  6. Step 6: Final answer
    x = 1,346.52

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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.