Home / 30,915.11-42,665.68-19,431.88

Finding the Fourth Proportional to 30,915.11, 42,665.68 and 19,431.88

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Solution

The fourth proportional to 30,915.11, 42,665.68 and 19,431.88 is: 26,817.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,915.11 : 42,665.68 = 19,431.88 : x
  2. Step 2: Convert to fraction form
    30,915.11/42,665.68 = 19,431.88/x
  3. Step 3: Cross multiply
    30,915.11x = 42,665.68 × 19,431.88
  4. Step 4: Simplify right side
    30,915.11x = 829,074,373.88
  5. Step 5: Solve for x
    x = 829,074,373.88/30,915.11
  6. Step 6: Final answer
    x = 26,817.77

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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.