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Finding the Fourth Proportional to 1,003.72, 1,386.86 and 723.40

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Solution

The fourth proportional to 1,003.72, 1,386.86 and 723.40 is: 999.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.72 : 1,386.86 = 723.40 : x
  2. Step 2: Convert to fraction form
    1,003.72/1,386.86 = 723.40/x
  3. Step 3: Cross multiply
    1,003.72x = 1,386.86 × 723.40
  4. Step 4: Simplify right side
    1,003.72x = 1,003,254.52
  5. Step 5: Solve for x
    x = 1,003,254.52/1,003.72
  6. Step 6: Final answer
    x = 999.54

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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.