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Finding the Fourth Proportional to 790.02, 1,089.81 and 491.13

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Solution

The fourth proportional to 790.02, 1,089.81 and 491.13 is: 677.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.02 : 1,089.81 = 491.13 : x
  2. Step 2: Convert to fraction form
    790.02/1,089.81 = 491.13/x
  3. Step 3: Cross multiply
    790.02x = 1,089.81 × 491.13
  4. Step 4: Simplify right side
    790.02x = 535,238.39
  5. Step 5: Solve for x
    x = 535,238.39/790.02
  6. Step 6: Final answer
    x = 677.50

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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.