Home / 21,918.32-30,248.40-12,970.96

Finding the Fourth Proportional to 21,918.32, 30,248.40 and 12,970.96

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Solution

The fourth proportional to 21,918.32, 30,248.40 and 12,970.96 is: 17,900.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,918.32 : 30,248.40 = 12,970.96 : x
  2. Step 2: Convert to fraction form
    21,918.32/30,248.40 = 12,970.96/x
  3. Step 3: Cross multiply
    21,918.32x = 30,248.40 × 12,970.96
  4. Step 4: Simplify right side
    21,918.32x = 392,350,786.46
  5. Step 5: Solve for x
    x = 392,350,786.46/21,918.32
  6. Step 6: Final answer
    x = 17,900.59

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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.