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Finding the Fourth Proportional to 1,014.75, 1,400.40 and 621.70

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Solution

The fourth proportional to 1,014.75, 1,400.40 and 621.70 is: 857.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,014.75 : 1,400.40 = 621.70 : x
  2. Step 2: Convert to fraction form
    1,014.75/1,400.40 = 621.70/x
  3. Step 3: Cross multiply
    1,014.75x = 1,400.40 × 621.70
  4. Step 4: Simplify right side
    1,014.75x = 870,625.18
  5. Step 5: Solve for x
    x = 870,625.18/1,014.75
  6. Step 6: Final answer
    x = 857.97

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1.5x scale

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.