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Finding the Fourth Proportional to 1,051.06, 1,449.98 and 678.16

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Solution

The fourth proportional to 1,051.06, 1,449.98 and 678.16 is: 935.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,051.06 : 1,449.98 = 678.16 : x
  2. Step 2: Convert to fraction form
    1,051.06/1,449.98 = 678.16/x
  3. Step 3: Cross multiply
    1,051.06x = 1,449.98 × 678.16
  4. Step 4: Simplify right side
    1,051.06x = 983,315.41
  5. Step 5: Solve for x
    x = 983,315.41/1,051.06
  6. Step 6: Final answer
    x = 935.55

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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.