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Finding the Fourth Proportional to 1,123.34, 1,685.48 and 538.65

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Solution

The fourth proportional to 1,123.34, 1,685.48 and 538.65 is: 808.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.34 : 1,685.48 = 538.65 : x
  2. Step 2: Convert to fraction form
    1,123.34/1,685.48 = 538.65/x
  3. Step 3: Cross multiply
    1,123.34x = 1,685.48 × 538.65
  4. Step 4: Simplify right side
    1,123.34x = 907,881.11
  5. Step 5: Solve for x
    x = 907,881.11/1,123.34
  6. Step 6: Final answer
    x = 808.20

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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.