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Finding the Fourth Proportional to 646.06, 891.56 and 380.50

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Solution

The fourth proportional to 646.06, 891.56 and 380.50 is: 525.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.06 : 891.56 = 380.50 : x
  2. Step 2: Convert to fraction form
    646.06/891.56 = 380.50/x
  3. Step 3: Cross multiply
    646.06x = 891.56 × 380.50
  4. Step 4: Simplify right side
    646.06x = 339,235.16
  5. Step 5: Solve for x
    x = 339,235.16/646.06
  6. Step 6: Final answer
    x = 525.08

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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.