Home / 30,675.76-42,306.32-21,130.88

Finding the Fourth Proportional to 30,675.76, 42,306.32 and 21,130.88

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Solution

The fourth proportional to 30,675.76, 42,306.32 and 21,130.88 is: 29,142.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,675.76 : 42,306.32 = 21,130.88 : x
  2. Step 2: Convert to fraction form
    30,675.76/42,306.32 = 21,130.88/x
  3. Step 3: Cross multiply
    30,675.76x = 42,306.32 × 21,130.88
  4. Step 4: Simplify right side
    30,675.76x = 893,969,771.16
  5. Step 5: Solve for x
    x = 893,969,771.16/30,675.76
  6. Step 6: Final answer
    x = 29,142.55

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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.