Home / 21,007.80-31,508.45-9,318.96

Finding the Fourth Proportional to 21,007.80, 31,508.45 and 9,318.96

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Solution

The fourth proportional to 21,007.80, 31,508.45 and 9,318.96 is: 13,977.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.80 : 31,508.45 = 9,318.96 : x
  2. Step 2: Convert to fraction form
    21,007.80/31,508.45 = 9,318.96/x
  3. Step 3: Cross multiply
    21,007.80x = 31,508.45 × 9,318.96
  4. Step 4: Simplify right side
    21,007.80x = 293,625,985.21
  5. Step 5: Solve for x
    x = 293,625,985.21/21,007.80
  6. Step 6: Final answer
    x = 13,977.00

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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.