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Finding the Fourth Proportional to 30,648.80, 42,295.28 and 17,220.40

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Solution

The fourth proportional to 30,648.80, 42,295.28 and 17,220.40 is: 23,764.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,648.80 : 42,295.28 = 17,220.40 : x
  2. Step 2: Convert to fraction form
    30,648.80/42,295.28 = 17,220.40/x
  3. Step 3: Cross multiply
    30,648.80x = 42,295.28 × 17,220.40
  4. Step 4: Simplify right side
    30,648.80x = 728,341,639.71
  5. Step 5: Solve for x
    x = 728,341,639.71/30,648.80
  6. Step 6: Final answer
    x = 23,764.12

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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.