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Finding the Fourth Proportional to 208,480.80, 287,695.80 and 112,985.45

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Solution

The fourth proportional to 208,480.80, 287,695.80 and 112,985.45 is: 155,915.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,480.80 : 287,695.80 = 112,985.45 : x
  2. Step 2: Convert to fraction form
    208,480.80/287,695.80 = 112,985.45/x
  3. Step 3: Cross multiply
    208,480.80x = 287,695.80 × 112,985.45
  4. Step 4: Simplify right side
    208,480.80x = 32,505,439,066.49
  5. Step 5: Solve for x
    x = 32,505,439,066.49/208,480.80
  6. Step 6: Final answer
    x = 155,915.74

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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.