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Finding the Fourth Proportional to 1,014.28, 1,400.76 and 621.58

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Solution

The fourth proportional to 1,014.28, 1,400.76 and 621.58 is: 858.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,014.28 : 1,400.76 = 621.58 : x
  2. Step 2: Convert to fraction form
    1,014.28/1,400.76 = 621.58/x
  3. Step 3: Cross multiply
    1,014.28x = 1,400.76 × 621.58
  4. Step 4: Simplify right side
    1,014.28x = 870,684.40
  5. Step 5: Solve for x
    x = 870,684.40/1,014.28
  6. Step 6: Final answer
    x = 858.43

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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.