Home / 20,981.25-31,461.62-9,878.58

Finding the Fourth Proportional to 20,981.25, 31,461.62 and 9,878.58

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Solution

The fourth proportional to 20,981.25, 31,461.62 and 9,878.58 is: 14,813.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.25 : 31,461.62 = 9,878.58 : x
  2. Step 2: Convert to fraction form
    20,981.25/31,461.62 = 9,878.58/x
  3. Step 3: Cross multiply
    20,981.25x = 31,461.62 × 9,878.58
  4. Step 4: Simplify right side
    20,981.25x = 310,796,080.71
  5. Step 5: Solve for x
    x = 310,796,080.71/20,981.25
  6. Step 6: Final answer
    x = 14,813.04

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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.