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Finding the Fourth Proportional to 1,018, 1,405.16 and 603.92

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Solution

The fourth proportional to 1,018, 1,405.16 and 603.92 is: 833.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018 : 1,405.16 = 603.92 : x
  2. Step 2: Convert to fraction form
    1,018/1,405.16 = 603.92/x
  3. Step 3: Cross multiply
    1,018x = 1,405.16 × 603.92
  4. Step 4: Simplify right side
    1,018x = 848,604.23
  5. Step 5: Solve for x
    x = 848,604.23/1,018
  6. Step 6: Final answer
    x = 833.60

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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.