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Finding the Fourth Proportional to 389,915.76, 538,053.72 and 220,166.64

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Solution

The fourth proportional to 389,915.76, 538,053.72 and 220,166.64 is: 303,813.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,915.76 : 538,053.72 = 220,166.64 : x
  2. Step 2: Convert to fraction form
    389,915.76/538,053.72 = 220,166.64/x
  3. Step 3: Cross multiply
    389,915.76x = 538,053.72 × 220,166.64
  4. Step 4: Simplify right side
    389,915.76x = 118,461,479,671.90
  5. Step 5: Solve for x
    x = 118,461,479,671.90/389,915.76
  6. Step 6: Final answer
    x = 303,813.01

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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.