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Finding the Fourth Proportional to 810.95, 1,119.02 and 474.80

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Solution

The fourth proportional to 810.95, 1,119.02 and 474.80 is: 655.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.95 : 1,119.02 = 474.80 : x
  2. Step 2: Convert to fraction form
    810.95/1,119.02 = 474.80/x
  3. Step 3: Cross multiply
    810.95x = 1,119.02 × 474.80
  4. Step 4: Simplify right side
    810.95x = 531,302.73
  5. Step 5: Solve for x
    x = 531,302.73/810.95
  6. Step 6: Final answer
    x = 655.16

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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.