Home / 1,005.32-1,386.23-631.85

Finding the Fourth Proportional to 1,005.32, 1,386.23 and 631.85

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Solution

The fourth proportional to 1,005.32, 1,386.23 and 631.85 is: 871.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.32 : 1,386.23 = 631.85 : x
  2. Step 2: Convert to fraction form
    1,005.32/1,386.23 = 631.85/x
  3. Step 3: Cross multiply
    1,005.32x = 1,386.23 × 631.85
  4. Step 4: Simplify right side
    1,005.32x = 875,886.27
  5. Step 5: Solve for x
    x = 875,886.27/1,005.32
  6. Step 6: Final answer
    x = 871.25

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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.