Home / 21,303.85-29,390.05-12,685.21

Finding the Fourth Proportional to 21,303.85, 29,390.05 and 12,685.21

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Solution

The fourth proportional to 21,303.85, 29,390.05 and 12,685.21 is: 17,500.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,303.85 : 29,390.05 = 12,685.21 : x
  2. Step 2: Convert to fraction form
    21,303.85/29,390.05 = 12,685.21/x
  3. Step 3: Cross multiply
    21,303.85x = 29,390.05 × 12,685.21
  4. Step 4: Simplify right side
    21,303.85x = 372,818,956.16
  5. Step 5: Solve for x
    x = 372,818,956.16/21,303.85
  6. Step 6: Final answer
    x = 17,500.07

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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.