Home / 31,100.84-42,885.26-21,011.78

Finding the Fourth Proportional to 31,100.84, 42,885.26 and 21,011.78

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Solution

The fourth proportional to 31,100.84, 42,885.26 and 21,011.78 is: 28,973.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,100.84 : 42,885.26 = 21,011.78 : x
  2. Step 2: Convert to fraction form
    31,100.84/42,885.26 = 21,011.78/x
  3. Step 3: Cross multiply
    31,100.84x = 42,885.26 × 21,011.78
  4. Step 4: Simplify right side
    31,100.84x = 901,095,648.36
  5. Step 5: Solve for x
    x = 901,095,648.36/31,100.84
  6. Step 6: Final answer
    x = 28,973.35

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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.