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Finding the Fourth Proportional to 1,070.12, 1,476.90 and 628.07

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Solution

The fourth proportional to 1,070.12, 1,476.90 and 628.07 is: 866.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.12 : 1,476.90 = 628.07 : x
  2. Step 2: Convert to fraction form
    1,070.12/1,476.90 = 628.07/x
  3. Step 3: Cross multiply
    1,070.12x = 1,476.90 × 628.07
  4. Step 4: Simplify right side
    1,070.12x = 927,589.20
  5. Step 5: Solve for x
    x = 927,589.20/1,070.12
  6. Step 6: Final answer
    x = 866.81

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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.