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Finding the Fourth Proportional to 790.02, 1,087.83 and 684.99

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Solution

The fourth proportional to 790.02, 1,087.83 and 684.99 is: 943.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.02 : 1,087.83 = 684.99 : x
  2. Step 2: Convert to fraction form
    790.02/1,087.83 = 684.99/x
  3. Step 3: Cross multiply
    790.02x = 1,087.83 × 684.99
  4. Step 4: Simplify right side
    790.02x = 745,152.67
  5. Step 5: Solve for x
    x = 745,152.67/790.02
  6. Step 6: Final answer
    x = 943.21

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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.