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Finding the Fourth Proportional to 1,258.58, 1,887.14 and 842.58

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Solution

The fourth proportional to 1,258.58, 1,887.14 and 842.58 is: 1,263.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.58 : 1,887.14 = 842.58 : x
  2. Step 2: Convert to fraction form
    1,258.58/1,887.14 = 842.58/x
  3. Step 3: Cross multiply
    1,258.58x = 1,887.14 × 842.58
  4. Step 4: Simplify right side
    1,258.58x = 1,590,066.42
  5. Step 5: Solve for x
    x = 1,590,066.42/1,258.58
  6. Step 6: Final answer
    x = 1,263.38

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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.