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Finding the Fourth Proportional to 208,574.80, 287,811.93 and 128,005.72

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Solution

The fourth proportional to 208,574.80, 287,811.93 and 128,005.72 is: 176,634.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,574.80 : 287,811.93 = 128,005.72 : x
  2. Step 2: Convert to fraction form
    208,574.80/287,811.93 = 128,005.72/x
  3. Step 3: Cross multiply
    208,574.80x = 287,811.93 × 128,005.72
  4. Step 4: Simplify right side
    208,574.80x = 36,841,573,084.73
  5. Step 5: Solve for x
    x = 36,841,573,084.73/208,574.80
  6. Step 6: Final answer
    x = 176,634.83

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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.