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Finding the Fourth Proportional to 61,912.62, 85,478.49 and 45,978.30

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Solution

The fourth proportional to 61,912.62, 85,478.49 and 45,978.30 is: 63,479.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,912.62 : 85,478.49 = 45,978.30 : x
  2. Step 2: Convert to fraction form
    61,912.62/85,478.49 = 45,978.30/x
  3. Step 3: Cross multiply
    61,912.62x = 85,478.49 × 45,978.30
  4. Step 4: Simplify right side
    61,912.62x = 3,930,155,656.77
  5. Step 5: Solve for x
    x = 3,930,155,656.77/61,912.62
  6. Step 6: Final answer
    x = 63,479.07

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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.