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Finding the Fourth Proportional to 19,278.96, 28,918.48 and 9,920.22

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Solution

The fourth proportional to 19,278.96, 28,918.48 and 9,920.22 is: 14,880.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,278.96 : 28,918.48 = 9,920.22 : x
  2. Step 2: Convert to fraction form
    19,278.96/28,918.48 = 9,920.22/x
  3. Step 3: Cross multiply
    19,278.96x = 28,918.48 × 9,920.22
  4. Step 4: Simplify right side
    19,278.96x = 286,877,683.67
  5. Step 5: Solve for x
    x = 286,877,683.67/19,278.96
  6. Step 6: Final answer
    x = 14,880.35

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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.