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Finding the Fourth Proportional to 208,575.80, 287,813.31 and 128,006.72

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Solution

The fourth proportional to 208,575.80, 287,813.31 and 128,006.72 is: 176,636.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,575.80 : 287,813.31 = 128,006.72 : x
  2. Step 2: Convert to fraction form
    208,575.80/287,813.31 = 128,006.72/x
  3. Step 3: Cross multiply
    208,575.80x = 287,813.31 × 128,006.72
  4. Step 4: Simplify right side
    208,575.80x = 36,842,037,785.44
  5. Step 5: Solve for x
    x = 36,842,037,785.44/208,575.80
  6. Step 6: Final answer
    x = 176,636.21

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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.