Home / 21,228.32-31,686.80-18,737.52

Finding the Fourth Proportional to 21,228.32, 31,686.80 and 18,737.52

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Solution

The fourth proportional to 21,228.32, 31,686.80 and 18,737.52 is: 27,968.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,228.32 : 31,686.80 = 18,737.52 : x
  2. Step 2: Convert to fraction form
    21,228.32/31,686.80 = 18,737.52/x
  3. Step 3: Cross multiply
    21,228.32x = 31,686.80 × 18,737.52
  4. Step 4: Simplify right side
    21,228.32x = 593,732,048.74
  5. Step 5: Solve for x
    x = 593,732,048.74/21,228.32
  6. Step 6: Final answer
    x = 27,968.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.