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Finding the Fourth Proportional to 1,009.18, 1,393.19 and 631.18

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Solution

The fourth proportional to 1,009.18, 1,393.19 and 631.18 is: 871.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.18 : 1,393.19 = 631.18 : x
  2. Step 2: Convert to fraction form
    1,009.18/1,393.19 = 631.18/x
  3. Step 3: Cross multiply
    1,009.18x = 1,393.19 × 631.18
  4. Step 4: Simplify right side
    1,009.18x = 879,351.76
  5. Step 5: Solve for x
    x = 879,351.76/1,009.18
  6. Step 6: Final answer
    x = 871.35

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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.