Home / 31,011.85-42,808.51-21,984.39

Finding the Fourth Proportional to 31,011.85, 42,808.51 and 21,984.39

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Solution

The fourth proportional to 31,011.85, 42,808.51 and 21,984.39 is: 30,347.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,011.85 : 42,808.51 = 21,984.39 : x
  2. Step 2: Convert to fraction form
    31,011.85/42,808.51 = 21,984.39/x
  3. Step 3: Cross multiply
    31,011.85x = 42,808.51 × 21,984.39
  4. Step 4: Simplify right side
    31,011.85x = 941,118,655.19
  5. Step 5: Solve for x
    x = 941,118,655.19/31,011.85
  6. Step 6: Final answer
    x = 30,347.07

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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.