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Finding the Fourth Proportional to 889.90, 1,228.12 and 516.89

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Solution

The fourth proportional to 889.90, 1,228.12 and 516.89 is: 713.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.90 : 1,228.12 = 516.89 : x
  2. Step 2: Convert to fraction form
    889.90/1,228.12 = 516.89/x
  3. Step 3: Cross multiply
    889.90x = 1,228.12 × 516.89
  4. Step 4: Simplify right side
    889.90x = 634,802.95
  5. Step 5: Solve for x
    x = 634,802.95/889.90
  6. Step 6: Final answer
    x = 713.34

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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.