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Finding the Fourth Proportional to 1,005.39, 1,507.95 and 275.04

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Solution

The fourth proportional to 1,005.39, 1,507.95 and 275.04 is: 412.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.39 : 1,507.95 = 275.04 : x
  2. Step 2: Convert to fraction form
    1,005.39/1,507.95 = 275.04/x
  3. Step 3: Cross multiply
    1,005.39x = 1,507.95 × 275.04
  4. Step 4: Simplify right side
    1,005.39x = 414,746.57
  5. Step 5: Solve for x
    x = 414,746.57/1,005.39
  6. Step 6: Final answer
    x = 412.52

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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.