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Finding the Fourth Proportional to 985.87, 1,479.62 and 499.06

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Solution

The fourth proportional to 985.87, 1,479.62 and 499.06 is: 749.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.87 : 1,479.62 = 499.06 : x
  2. Step 2: Convert to fraction form
    985.87/1,479.62 = 499.06/x
  3. Step 3: Cross multiply
    985.87x = 1,479.62 × 499.06
  4. Step 4: Simplify right side
    985.87x = 738,419.45
  5. Step 5: Solve for x
    x = 738,419.45/985.87
  6. Step 6: Final answer
    x = 749.00

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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.