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Finding the Fourth Proportional to 1,018.17, 1,405.62 and 669.42

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Solution

The fourth proportional to 1,018.17, 1,405.62 and 669.42 is: 924.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.17 : 1,405.62 = 669.42 : x
  2. Step 2: Convert to fraction form
    1,018.17/1,405.62 = 669.42/x
  3. Step 3: Cross multiply
    1,018.17x = 1,405.62 × 669.42
  4. Step 4: Simplify right side
    1,018.17x = 940,950.14
  5. Step 5: Solve for x
    x = 940,950.14/1,018.17
  6. Step 6: Final answer
    x = 924.16

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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.