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Finding the Fourth Proportional to 846.40, 1,269.80 and 269.28

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Solution

The fourth proportional to 846.40, 1,269.80 and 269.28 is: 403.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    846.40 : 1,269.80 = 269.28 : x
  2. Step 2: Convert to fraction form
    846.40/1,269.80 = 269.28/x
  3. Step 3: Cross multiply
    846.40x = 1,269.80 × 269.28
  4. Step 4: Simplify right side
    846.40x = 341,931.74
  5. Step 5: Solve for x
    x = 341,931.74/846.40
  6. Step 6: Final answer
    x = 403.98

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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.