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Finding the Fourth Proportional to 1,258.61, 1,736.29 and 816.65

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Solution

The fourth proportional to 1,258.61, 1,736.29 and 816.65 is: 1,126.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.61 : 1,736.29 = 816.65 : x
  2. Step 2: Convert to fraction form
    1,258.61/1,736.29 = 816.65/x
  3. Step 3: Cross multiply
    1,258.61x = 1,736.29 × 816.65
  4. Step 4: Simplify right side
    1,258.61x = 1,417,941.23
  5. Step 5: Solve for x
    x = 1,417,941.23/1,258.61
  6. Step 6: Final answer
    x = 1,126.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.