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Finding the Fourth Proportional to 918.64, 1,267.16 and 642.16

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Solution

The fourth proportional to 918.64, 1,267.16 and 642.16 is: 885.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.64 : 1,267.16 = 642.16 : x
  2. Step 2: Convert to fraction form
    918.64/1,267.16 = 642.16/x
  3. Step 3: Cross multiply
    918.64x = 1,267.16 × 642.16
  4. Step 4: Simplify right side
    918.64x = 813,719.47
  5. Step 5: Solve for x
    x = 813,719.47/918.64
  6. Step 6: Final answer
    x = 885.79

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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.