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Finding the Fourth Proportional to 30,965.40, 42,735.90 and 18,390.16

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Solution

The fourth proportional to 30,965.40, 42,735.90 and 18,390.16 is: 25,380.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,965.40 : 42,735.90 = 18,390.16 : x
  2. Step 2: Convert to fraction form
    30,965.40/42,735.90 = 18,390.16/x
  3. Step 3: Cross multiply
    30,965.40x = 42,735.90 × 18,390.16
  4. Step 4: Simplify right side
    30,965.40x = 785,920,038.74
  5. Step 5: Solve for x
    x = 785,920,038.74/30,965.40
  6. Step 6: Final answer
    x = 25,380.59

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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.