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Finding the Fourth Proportional to 28,641.71, 42,965.48 and 9,921.71

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Solution

The fourth proportional to 28,641.71, 42,965.48 and 9,921.71 is: 14,883.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,641.71 : 42,965.48 = 9,921.71 : x
  2. Step 2: Convert to fraction form
    28,641.71/42,965.48 = 9,921.71/x
  3. Step 3: Cross multiply
    28,641.71x = 42,965.48 × 9,921.71
  4. Step 4: Simplify right side
    28,641.71x = 426,291,164.79
  5. Step 5: Solve for x
    x = 426,291,164.79/28,641.71
  6. Step 6: Final answer
    x = 14,883.58

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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.