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Finding the Fourth Proportional to 11,378.90, 17,068.35 and 9,920.90

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Solution

The fourth proportional to 11,378.90, 17,068.35 and 9,920.90 is: 14,881.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,378.90 : 17,068.35 = 9,920.90 : x
  2. Step 2: Convert to fraction form
    11,378.90/17,068.35 = 9,920.90/x
  3. Step 3: Cross multiply
    11,378.90x = 17,068.35 × 9,920.90
  4. Step 4: Simplify right side
    11,378.90x = 169,333,393.52
  5. Step 5: Solve for x
    x = 169,333,393.52/11,378.90
  6. Step 6: Final answer
    x = 14,881.35

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1.5x scale

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.