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Finding the Fourth Proportional to 1,019.99, 1,405.55 and 724.75

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Solution

The fourth proportional to 1,019.99, 1,405.55 and 724.75 is: 998.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.99 : 1,405.55 = 724.75 : x
  2. Step 2: Convert to fraction form
    1,019.99/1,405.55 = 724.75/x
  3. Step 3: Cross multiply
    1,019.99x = 1,405.55 × 724.75
  4. Step 4: Simplify right side
    1,019.99x = 1,018,670.66
  5. Step 5: Solve for x
    x = 1,018,670.66/1,019.99
  6. Step 6: Final answer
    x = 998.70

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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.