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Finding the Fourth Proportional to 1,005.96, 1,387.80 and 670.26

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Solution

The fourth proportional to 1,005.96, 1,387.80 and 670.26 is: 924.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.96 : 1,387.80 = 670.26 : x
  2. Step 2: Convert to fraction form
    1,005.96/1,387.80 = 670.26/x
  3. Step 3: Cross multiply
    1,005.96x = 1,387.80 × 670.26
  4. Step 4: Simplify right side
    1,005.96x = 930,186.83
  5. Step 5: Solve for x
    x = 930,186.83/1,005.96
  6. Step 6: Final answer
    x = 924.68

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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.