Home / 20,890.16-31,312.12-9,787.76

Finding the Fourth Proportional to 20,890.16, 31,312.12 and 9,787.76

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Solution

The fourth proportional to 20,890.16, 31,312.12 and 9,787.76 is: 14,670.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.16 : 31,312.12 = 9,787.76 : x
  2. Step 2: Convert to fraction form
    20,890.16/31,312.12 = 9,787.76/x
  3. Step 3: Cross multiply
    20,890.16x = 31,312.12 × 9,787.76
  4. Step 4: Simplify right side
    20,890.16x = 306,475,515.65
  5. Step 5: Solve for x
    x = 306,475,515.65/20,890.16
  6. Step 6: Final answer
    x = 14,670.81

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1.5x scale

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.