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Finding the Fourth Proportional to 18,929.70, 28,386.25 and 6,446.28

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Solution

The fourth proportional to 18,929.70, 28,386.25 and 6,446.28 is: 9,666.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,929.70 : 28,386.25 = 6,446.28 : x
  2. Step 2: Convert to fraction form
    18,929.70/28,386.25 = 6,446.28/x
  3. Step 3: Cross multiply
    18,929.70x = 28,386.25 × 6,446.28
  4. Step 4: Simplify right side
    18,929.70x = 182,985,805.98
  5. Step 5: Solve for x
    x = 182,985,805.98/18,929.70
  6. Step 6: Final answer
    x = 9,666.60

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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.