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Finding the Fourth Proportional to 1,257.51, 1,886.37 and 435.45

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Solution

The fourth proportional to 1,257.51, 1,886.37 and 435.45 is: 653.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.51 : 1,886.37 = 435.45 : x
  2. Step 2: Convert to fraction form
    1,257.51/1,886.37 = 435.45/x
  3. Step 3: Cross multiply
    1,257.51x = 1,886.37 × 435.45
  4. Step 4: Simplify right side
    1,257.51x = 821,419.82
  5. Step 5: Solve for x
    x = 821,419.82/1,257.51
  6. Step 6: Final answer
    x = 653.21

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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.