Home / 1,685.70-2,326.40-977.74

Finding the Fourth Proportional to 1,685.70, 2,326.40 and 977.74

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Solution

The fourth proportional to 1,685.70, 2,326.40 and 977.74 is: 1,349.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.70 : 2,326.40 = 977.74 : x
  2. Step 2: Convert to fraction form
    1,685.70/2,326.40 = 977.74/x
  3. Step 3: Cross multiply
    1,685.70x = 2,326.40 × 977.74
  4. Step 4: Simplify right side
    1,685.70x = 2,274,614.34
  5. Step 5: Solve for x
    x = 2,274,614.34/1,685.70
  6. Step 6: Final answer
    x = 1,349.36

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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.