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Finding the Fourth Proportional to 1,645.12, 2,270.24 and 899.12

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Solution

The fourth proportional to 1,645.12, 2,270.24 and 899.12 is: 1,240.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,645.12 : 2,270.24 = 899.12 : x
  2. Step 2: Convert to fraction form
    1,645.12/2,270.24 = 899.12/x
  3. Step 3: Cross multiply
    1,645.12x = 2,270.24 × 899.12
  4. Step 4: Simplify right side
    1,645.12x = 2,041,218.19
  5. Step 5: Solve for x
    x = 2,041,218.19/1,645.12
  6. Step 6: Final answer
    x = 1,240.77

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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.