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Finding the Fourth Proportional to 873.18, 1,315.90 and 786.62

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Solution

The fourth proportional to 873.18, 1,315.90 and 786.62 is: 1,185.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.18 : 1,315.90 = 786.62 : x
  2. Step 2: Convert to fraction form
    873.18/1,315.90 = 786.62/x
  3. Step 3: Cross multiply
    873.18x = 1,315.90 × 786.62
  4. Step 4: Simplify right side
    873.18x = 1,035,113.26
  5. Step 5: Solve for x
    x = 1,035,113.26/873.18
  6. Step 6: Final answer
    x = 1,185.45

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.