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Finding the Fourth Proportional to 877.12, 1,210.50 and 484.21

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Solution

The fourth proportional to 877.12, 1,210.50 and 484.21 is: 668.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.12 : 1,210.50 = 484.21 : x
  2. Step 2: Convert to fraction form
    877.12/1,210.50 = 484.21/x
  3. Step 3: Cross multiply
    877.12x = 1,210.50 × 484.21
  4. Step 4: Simplify right side
    877.12x = 586,136.21
  5. Step 5: Solve for x
    x = 586,136.21/877.12
  6. Step 6: Final answer
    x = 668.25

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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.