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Finding the Fourth Proportional to 1,008.93, 1,513.53 and 990.84

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Solution

The fourth proportional to 1,008.93, 1,513.53 and 990.84 is: 1,486.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.93 : 1,513.53 = 990.84 : x
  2. Step 2: Convert to fraction form
    1,008.93/1,513.53 = 990.84/x
  3. Step 3: Cross multiply
    1,008.93x = 1,513.53 × 990.84
  4. Step 4: Simplify right side
    1,008.93x = 1,499,666.07
  5. Step 5: Solve for x
    x = 1,499,666.07/1,008.93
  6. Step 6: Final answer
    x = 1,486.39

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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.