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Finding the Fourth Proportional to 1,005.62, 1,386.86 and 632.64

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Solution

The fourth proportional to 1,005.62, 1,386.86 and 632.64 is: 872.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.62 : 1,386.86 = 632.64 : x
  2. Step 2: Convert to fraction form
    1,005.62/1,386.86 = 632.64/x
  3. Step 3: Cross multiply
    1,005.62x = 1,386.86 × 632.64
  4. Step 4: Simplify right side
    1,005.62x = 877,383.11
  5. Step 5: Solve for x
    x = 877,383.11/1,005.62
  6. Step 6: Final answer
    x = 872.48

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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.