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Finding the Fourth Proportional to 877.99, 1,211.63 and 485.02

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Solution

The fourth proportional to 877.99, 1,211.63 and 485.02 is: 669.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.99 : 1,211.63 = 485.02 : x
  2. Step 2: Convert to fraction form
    877.99/1,211.63 = 485.02/x
  3. Step 3: Cross multiply
    877.99x = 1,211.63 × 485.02
  4. Step 4: Simplify right side
    877.99x = 587,664.78
  5. Step 5: Solve for x
    x = 587,664.78/877.99
  6. Step 6: Final answer
    x = 669.33

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1.5x scale

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.