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Finding the Fourth Proportional to 1,341.21, 2,010.95 and 646.50

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Solution

The fourth proportional to 1,341.21, 2,010.95 and 646.50 is: 969.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,341.21 : 2,010.95 = 646.50 : x
  2. Step 2: Convert to fraction form
    1,341.21/2,010.95 = 646.50/x
  3. Step 3: Cross multiply
    1,341.21x = 2,010.95 × 646.50
  4. Step 4: Simplify right side
    1,341.21x = 1,300,079.18
  5. Step 5: Solve for x
    x = 1,300,079.18/1,341.21
  6. Step 6: Final answer
    x = 969.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.