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Finding the Fourth Proportional to 64,775.20, 89,392.80 and 39,282.40

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Solution

The fourth proportional to 64,775.20, 89,392.80 and 39,282.40 is: 54,211.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,775.20 : 89,392.80 = 39,282.40 : x
  2. Step 2: Convert to fraction form
    64,775.20/89,392.80 = 39,282.40/x
  3. Step 3: Cross multiply
    64,775.20x = 89,392.80 × 39,282.40
  4. Step 4: Simplify right side
    64,775.20x = 3,511,563,726.72
  5. Step 5: Solve for x
    x = 3,511,563,726.72/64,775.20
  6. Step 6: Final answer
    x = 54,211.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.