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Finding the Fourth Proportional to 1,356.58, 1,870.23 and 858.97

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Solution

The fourth proportional to 1,356.58, 1,870.23 and 858.97 is: 1,184.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,356.58 : 1,870.23 = 858.97 : x
  2. Step 2: Convert to fraction form
    1,356.58/1,870.23 = 858.97/x
  3. Step 3: Cross multiply
    1,356.58x = 1,870.23 × 858.97
  4. Step 4: Simplify right side
    1,356.58x = 1,606,471.46
  5. Step 5: Solve for x
    x = 1,606,471.46/1,356.58
  6. Step 6: Final answer
    x = 1,184.21

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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.