Home / 15,421.42-21,280.34-8,708.68

Finding the Fourth Proportional to 15,421.42, 21,280.34 and 8,708.68

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Solution

The fourth proportional to 15,421.42, 21,280.34 and 8,708.68 is: 12,017.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,421.42 : 21,280.34 = 8,708.68 : x
  2. Step 2: Convert to fraction form
    15,421.42/21,280.34 = 8,708.68/x
  3. Step 3: Cross multiply
    15,421.42x = 21,280.34 × 8,708.68
  4. Step 4: Simplify right side
    15,421.42x = 185,323,671.35
  5. Step 5: Solve for x
    x = 185,323,671.35/15,421.42
  6. Step 6: Final answer
    x = 12,017.29

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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.