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Finding the Fourth Proportional to 1,256.68, 1,885.58 and 435.54

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Solution

The fourth proportional to 1,256.68, 1,885.58 and 435.54 is: 653.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.68 : 1,885.58 = 435.54 : x
  2. Step 2: Convert to fraction form
    1,256.68/1,885.58 = 435.54/x
  3. Step 3: Cross multiply
    1,256.68x = 1,885.58 × 435.54
  4. Step 4: Simplify right side
    1,256.68x = 821,252.04
  5. Step 5: Solve for x
    x = 821,252.04/1,256.68
  6. Step 6: Final answer
    x = 653.51

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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.