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Finding the Fourth Proportional to 670.18, 1,005.27 and 259.51

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Solution

The fourth proportional to 670.18, 1,005.27 and 259.51 is: 389.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.18 : 1,005.27 = 259.51 : x
  2. Step 2: Convert to fraction form
    670.18/1,005.27 = 259.51/x
  3. Step 3: Cross multiply
    670.18x = 1,005.27 × 259.51
  4. Step 4: Simplify right side
    670.18x = 260,877.62
  5. Step 5: Solve for x
    x = 260,877.62/670.18
  6. Step 6: Final answer
    x = 389.27

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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.