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Finding the Fourth Proportional to 1,258.77, 1,887.96 and 642.93

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Solution

The fourth proportional to 1,258.77, 1,887.96 and 642.93 is: 964.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.77 : 1,887.96 = 642.93 : x
  2. Step 2: Convert to fraction form
    1,258.77/1,887.96 = 642.93/x
  3. Step 3: Cross multiply
    1,258.77x = 1,887.96 × 642.93
  4. Step 4: Simplify right side
    1,258.77x = 1,213,826.12
  5. Step 5: Solve for x
    x = 1,213,826.12/1,258.77
  6. Step 6: Final answer
    x = 964.30

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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.