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Finding the Fourth Proportional to 28,642.55, 42,953.56 and 9,917.55

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Solution

The fourth proportional to 28,642.55, 42,953.56 and 9,917.55 is: 14,872.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,642.55 : 42,953.56 = 9,917.55 : x
  2. Step 2: Convert to fraction form
    28,642.55/42,953.56 = 9,917.55/x
  3. Step 3: Cross multiply
    28,642.55x = 42,953.56 × 9,917.55
  4. Step 4: Simplify right side
    28,642.55x = 425,994,054.18
  5. Step 5: Solve for x
    x = 425,994,054.18/28,642.55
  6. Step 6: Final answer
    x = 14,872.77

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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.