Home / 21,023.90-31,500.16-12,686.40

Finding the Fourth Proportional to 21,023.90, 31,500.16 and 12,686.40

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Solution

The fourth proportional to 21,023.90, 31,500.16 and 12,686.40 is: 19,008.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,023.90 : 31,500.16 = 12,686.40 : x
  2. Step 2: Convert to fraction form
    21,023.90/31,500.16 = 12,686.40/x
  3. Step 3: Cross multiply
    21,023.90x = 31,500.16 × 12,686.40
  4. Step 4: Simplify right side
    21,023.90x = 399,623,629.82
  5. Step 5: Solve for x
    x = 399,623,629.82/21,023.90
  6. Step 6: Final answer
    x = 19,008.06

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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.