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Finding the Fourth Proportional to 1,555.34, 2,145.79 and 925.90

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Solution

The fourth proportional to 1,555.34, 2,145.79 and 925.90 is: 1,277.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.34 : 2,145.79 = 925.90 : x
  2. Step 2: Convert to fraction form
    1,555.34/2,145.79 = 925.90/x
  3. Step 3: Cross multiply
    1,555.34x = 2,145.79 × 925.90
  4. Step 4: Simplify right side
    1,555.34x = 1,986,786.96
  5. Step 5: Solve for x
    x = 1,986,786.96/1,555.34
  6. Step 6: Final answer
    x = 1,277.40

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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.