Home / 20,935.86-31,403.90-10,403.40

Finding the Fourth Proportional to 20,935.86, 31,403.90 and 10,403.40

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Solution

The fourth proportional to 20,935.86, 31,403.90 and 10,403.40 is: 15,605.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,935.86 : 31,403.90 = 10,403.40 : x
  2. Step 2: Convert to fraction form
    20,935.86/31,403.90 = 10,403.40/x
  3. Step 3: Cross multiply
    20,935.86x = 31,403.90 × 10,403.40
  4. Step 4: Simplify right side
    20,935.86x = 326,707,281.24
  5. Step 5: Solve for x
    x = 326,707,281.24/20,935.86
  6. Step 6: Final answer
    x = 15,605.15

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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.