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Finding the Fourth Proportional to 1,282.21, 1,921.69 and 870.32

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Solution

The fourth proportional to 1,282.21, 1,921.69 and 870.32 is: 1,304.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.21 : 1,921.69 = 870.32 : x
  2. Step 2: Convert to fraction form
    1,282.21/1,921.69 = 870.32/x
  3. Step 3: Cross multiply
    1,282.21x = 1,921.69 × 870.32
  4. Step 4: Simplify right side
    1,282.21x = 1,672,485.24
  5. Step 5: Solve for x
    x = 1,672,485.24/1,282.21
  6. Step 6: Final answer
    x = 1,304.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.