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Finding the Fourth Proportional to 1,038.90, 1,434.33 and 909.30

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Solution

The fourth proportional to 1,038.90, 1,434.33 and 909.30 is: 1,255.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.90 : 1,434.33 = 909.30 : x
  2. Step 2: Convert to fraction form
    1,038.90/1,434.33 = 909.30/x
  3. Step 3: Cross multiply
    1,038.90x = 1,434.33 × 909.30
  4. Step 4: Simplify right side
    1,038.90x = 1,304,236.27
  5. Step 5: Solve for x
    x = 1,304,236.27/1,038.90
  6. Step 6: Final answer
    x = 1,255.40

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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.