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Finding the Fourth Proportional to 1,007.53, 1,502.93 and 990.83

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Solution

The fourth proportional to 1,007.53, 1,502.93 and 990.83 is: 1,478.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.53 : 1,502.93 = 990.83 : x
  2. Step 2: Convert to fraction form
    1,007.53/1,502.93 = 990.83/x
  3. Step 3: Cross multiply
    1,007.53x = 1,502.93 × 990.83
  4. Step 4: Simplify right side
    1,007.53x = 1,489,135.66
  5. Step 5: Solve for x
    x = 1,489,135.66/1,007.53
  6. Step 6: Final answer
    x = 1,478.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.