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Finding the Fourth Proportional to 1,009.86, 1,515.09 and 316.60

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Solution

The fourth proportional to 1,009.86, 1,515.09 and 316.60 is: 475.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.86 : 1,515.09 = 316.60 : x
  2. Step 2: Convert to fraction form
    1,009.86/1,515.09 = 316.60/x
  3. Step 3: Cross multiply
    1,009.86x = 1,515.09 × 316.60
  4. Step 4: Simplify right side
    1,009.86x = 479,683.42
  5. Step 5: Solve for x
    x = 479,683.42/1,009.86
  6. Step 6: Final answer
    x = 475.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.