Home / 31,066.79-42,857.51-20,998.74

Finding the Fourth Proportional to 31,066.79, 42,857.51 and 20,998.74

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Solution

The fourth proportional to 31,066.79, 42,857.51 and 20,998.74 is: 28,968.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,066.79 : 42,857.51 = 20,998.74 : x
  2. Step 2: Convert to fraction form
    31,066.79/42,857.51 = 20,998.74/x
  3. Step 3: Cross multiply
    31,066.79x = 42,857.51 × 20,998.74
  4. Step 4: Simplify right side
    31,066.79x = 899,953,765.26
  5. Step 5: Solve for x
    x = 899,953,765.26/31,066.79
  6. Step 6: Final answer
    x = 28,968.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.