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Finding the Fourth Proportional to 1,014.58, 1,400.48 and 621.64

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Solution

The fourth proportional to 1,014.58, 1,400.48 and 621.64 is: 858.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,014.58 : 1,400.48 = 621.64 : x
  2. Step 2: Convert to fraction form
    1,014.58/1,400.48 = 621.64/x
  3. Step 3: Cross multiply
    1,014.58x = 1,400.48 × 621.64
  4. Step 4: Simplify right side
    1,014.58x = 870,594.39
  5. Step 5: Solve for x
    x = 870,594.39/1,014.58
  6. Step 6: Final answer
    x = 858.08

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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.