Home / 1,071.16-1,478.35-629.21

Finding the Fourth Proportional to 1,071.16, 1,478.35 and 629.21

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Solution

The fourth proportional to 1,071.16, 1,478.35 and 629.21 is: 868.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.16 : 1,478.35 = 629.21 : x
  2. Step 2: Convert to fraction form
    1,071.16/1,478.35 = 629.21/x
  3. Step 3: Cross multiply
    1,071.16x = 1,478.35 × 629.21
  4. Step 4: Simplify right side
    1,071.16x = 930,192.60
  5. Step 5: Solve for x
    x = 930,192.60/1,071.16
  6. Step 6: Final answer
    x = 868.40

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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.