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Finding the Fourth Proportional to 1,123.40, 1,685.44 and 877.45

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Solution

The fourth proportional to 1,123.40, 1,685.44 and 877.45 is: 1,316.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.40 : 1,685.44 = 877.45 : x
  2. Step 2: Convert to fraction form
    1,123.40/1,685.44 = 877.45/x
  3. Step 3: Cross multiply
    1,123.40x = 1,685.44 × 877.45
  4. Step 4: Simplify right side
    1,123.40x = 1,478,889.33
  5. Step 5: Solve for x
    x = 1,478,889.33/1,123.40
  6. Step 6: Final answer
    x = 1,316.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.