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Finding the Fourth Proportional to 39,478.79, 54,479.84 and 21,573.91

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Solution

The fourth proportional to 39,478.79, 54,479.84 and 21,573.91 is: 29,771.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,478.79 : 54,479.84 = 21,573.91 : x
  2. Step 2: Convert to fraction form
    39,478.79/54,479.84 = 21,573.91/x
  3. Step 3: Cross multiply
    39,478.79x = 54,479.84 × 21,573.91
  4. Step 4: Simplify right side
    39,478.79x = 1,175,342,818.76
  5. Step 5: Solve for x
    x = 1,175,342,818.76/39,478.79
  6. Step 6: Final answer
    x = 29,771.50

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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.