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Finding the Fourth Proportional to 1,361.21, 2,041.76 and 436.76

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Solution

The fourth proportional to 1,361.21, 2,041.76 and 436.76 is: 655.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.21 : 2,041.76 = 436.76 : x
  2. Step 2: Convert to fraction form
    1,361.21/2,041.76 = 436.76/x
  3. Step 3: Cross multiply
    1,361.21x = 2,041.76 × 436.76
  4. Step 4: Simplify right side
    1,361.21x = 891,746.71
  5. Step 5: Solve for x
    x = 891,746.71/1,361.21
  6. Step 6: Final answer
    x = 655.12

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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.