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Finding the Fourth Proportional to 1,205, 1,807.92 and 435.56

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Solution

The fourth proportional to 1,205, 1,807.92 and 435.56 is: 653.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205 : 1,807.92 = 435.56 : x
  2. Step 2: Convert to fraction form
    1,205/1,807.92 = 435.56/x
  3. Step 3: Cross multiply
    1,205x = 1,807.92 × 435.56
  4. Step 4: Simplify right side
    1,205x = 787,457.64
  5. Step 5: Solve for x
    x = 787,457.64/1,205
  6. Step 6: Final answer
    x = 653.49

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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.