Home / 30,720.84-42,390.92-19,385.96

Finding the Fourth Proportional to 30,720.84, 42,390.92 and 19,385.96

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Solution

The fourth proportional to 30,720.84, 42,390.92 and 19,385.96 is: 26,750.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,720.84 : 42,390.92 = 19,385.96 : x
  2. Step 2: Convert to fraction form
    30,720.84/42,390.92 = 19,385.96/x
  3. Step 3: Cross multiply
    30,720.84x = 42,390.92 × 19,385.96
  4. Step 4: Simplify right side
    30,720.84x = 821,788,679.48
  5. Step 5: Solve for x
    x = 821,788,679.48/30,720.84
  6. Step 6: Final answer
    x = 26,750.20

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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.