Home / 30,497.90-42,120-20,962.98

Finding the Fourth Proportional to 30,497.90, 42,120 and 20,962.98

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Solution

The fourth proportional to 30,497.90, 42,120 and 20,962.98 is: 28,951.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,497.90 : 42,120 = 20,962.98 : x
  2. Step 2: Convert to fraction form
    30,497.90/42,120 = 20,962.98/x
  3. Step 3: Cross multiply
    30,497.90x = 42,120 × 20,962.98
  4. Step 4: Simplify right side
    30,497.90x = 882,960,717.60
  5. Step 5: Solve for x
    x = 882,960,717.60/30,497.90
  6. Step 6: Final answer
    x = 28,951.53

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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.