Home / 31,102.84-42,888.02-21,013.78

Finding the Fourth Proportional to 31,102.84, 42,888.02 and 21,013.78

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Solution

The fourth proportional to 31,102.84, 42,888.02 and 21,013.78 is: 28,976.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,102.84 : 42,888.02 = 21,013.78 : x
  2. Step 2: Convert to fraction form
    31,102.84/42,888.02 = 21,013.78/x
  3. Step 3: Cross multiply
    31,102.84x = 42,888.02 × 21,013.78
  4. Step 4: Simplify right side
    31,102.84x = 901,239,416.92
  5. Step 5: Solve for x
    x = 901,239,416.92/31,102.84
  6. Step 6: Final answer
    x = 28,976.11

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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.