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Finding the Fourth Proportional to 889.07, 1,225.46 and 711.72

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Solution

The fourth proportional to 889.07, 1,225.46 and 711.72 is: 981.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.07 : 1,225.46 = 711.72 : x
  2. Step 2: Convert to fraction form
    889.07/1,225.46 = 711.72/x
  3. Step 3: Cross multiply
    889.07x = 1,225.46 × 711.72
  4. Step 4: Simplify right side
    889.07x = 872,186.17
  5. Step 5: Solve for x
    x = 872,186.17/889.07
  6. Step 6: Final answer
    x = 981.02

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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.