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Finding the Fourth Proportional to 28,641.86, 42,959.60 and 8,918.76

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Solution

The fourth proportional to 28,641.86, 42,959.60 and 8,918.76 is: 13,377.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,641.86 : 42,959.60 = 8,918.76 : x
  2. Step 2: Convert to fraction form
    28,641.86/42,959.60 = 8,918.76/x
  3. Step 3: Cross multiply
    28,641.86x = 42,959.60 × 8,918.76
  4. Step 4: Simplify right side
    28,641.86x = 383,146,362.10
  5. Step 5: Solve for x
    x = 383,146,362.10/28,641.86
  6. Step 6: Final answer
    x = 13,377.15

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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.