Home / 30,720.42-42,407.24-20,654.70

Finding the Fourth Proportional to 30,720.42, 42,407.24 and 20,654.70

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Solution

The fourth proportional to 30,720.42, 42,407.24 and 20,654.70 is: 28,512.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,720.42 : 42,407.24 = 20,654.70 : x
  2. Step 2: Convert to fraction form
    30,720.42/42,407.24 = 20,654.70/x
  3. Step 3: Cross multiply
    30,720.42x = 42,407.24 × 20,654.70
  4. Step 4: Simplify right side
    30,720.42x = 875,908,702.96
  5. Step 5: Solve for x
    x = 875,908,702.96/30,720.42
  6. Step 6: Final answer
    x = 28,512.26

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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.