Home / 287,721.30-431,711.55-137,903.70

Finding the Fourth Proportional to 287,721.30, 431,711.55 and 137,903.70

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Solution

The fourth proportional to 287,721.30, 431,711.55 and 137,903.70 is: 206,917.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,721.30 : 431,711.55 = 137,903.70 : x
  2. Step 2: Convert to fraction form
    287,721.30/431,711.55 = 137,903.70/x
  3. Step 3: Cross multiply
    287,721.30x = 431,711.55 × 137,903.70
  4. Step 4: Simplify right side
    287,721.30x = 59,534,620,077.74
  5. Step 5: Solve for x
    x = 59,534,620,077.74/287,721.30
  6. Step 6: Final answer
    x = 206,917.67

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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.