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Finding the Fourth Proportional to 1,070.81, 1,477.61 and 628.85

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Solution

The fourth proportional to 1,070.81, 1,477.61 and 628.85 is: 867.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.81 : 1,477.61 = 628.85 : x
  2. Step 2: Convert to fraction form
    1,070.81/1,477.61 = 628.85/x
  3. Step 3: Cross multiply
    1,070.81x = 1,477.61 × 628.85
  4. Step 4: Simplify right side
    1,070.81x = 929,191.90
  5. Step 5: Solve for x
    x = 929,191.90/1,070.81
  6. Step 6: Final answer
    x = 867.75

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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.