Home / 21,156.20-31,712.70-12,386.60

Finding the Fourth Proportional to 21,156.20, 31,712.70 and 12,386.60

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Solution

The fourth proportional to 21,156.20, 31,712.70 and 12,386.60 is: 18,567.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,156.20 : 31,712.70 = 12,386.60 : x
  2. Step 2: Convert to fraction form
    21,156.20/31,712.70 = 12,386.60/x
  3. Step 3: Cross multiply
    21,156.20x = 31,712.70 × 12,386.60
  4. Step 4: Simplify right side
    21,156.20x = 392,812,529.82
  5. Step 5: Solve for x
    x = 392,812,529.82/21,156.20
  6. Step 6: Final answer
    x = 18,567.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.