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Finding the Fourth Proportional to 1,258.69, 1,887.90 and 770.89

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Solution

The fourth proportional to 1,258.69, 1,887.90 and 770.89 is: 1,156.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.69 : 1,887.90 = 770.89 : x
  2. Step 2: Convert to fraction form
    1,258.69/1,887.90 = 770.89/x
  3. Step 3: Cross multiply
    1,258.69x = 1,887.90 × 770.89
  4. Step 4: Simplify right side
    1,258.69x = 1,455,363.23
  5. Step 5: Solve for x
    x = 1,455,363.23/1,258.69
  6. Step 6: Final answer
    x = 1,156.25

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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.