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Finding the Fourth Proportional to 64,980.78, 89,655.66 and 39,465.78

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Solution

The fourth proportional to 64,980.78, 89,655.66 and 39,465.78 is: 54,451.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,980.78 : 89,655.66 = 39,465.78 : x
  2. Step 2: Convert to fraction form
    64,980.78/89,655.66 = 39,465.78/x
  3. Step 3: Cross multiply
    64,980.78x = 89,655.66 × 39,465.78
  4. Step 4: Simplify right side
    64,980.78x = 3,538,330,553.31
  5. Step 5: Solve for x
    x = 3,538,330,553.31/64,980.78
  6. Step 6: Final answer
    x = 54,451.96

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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.