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Finding the Fourth Proportional to 260,079.40, 389,535.90 and 213,423.40

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Solution

The fourth proportional to 260,079.40, 389,535.90 and 213,423.40 is: 319,656.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,079.40 : 389,535.90 = 213,423.40 : x
  2. Step 2: Convert to fraction form
    260,079.40/389,535.90 = 213,423.40/x
  3. Step 3: Cross multiply
    260,079.40x = 389,535.90 × 213,423.40
  4. Step 4: Simplify right side
    260,079.40x = 83,136,076,200.06
  5. Step 5: Solve for x
    x = 83,136,076,200.06/260,079.40
  6. Step 6: Final answer
    x = 319,656.52

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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.