Home / 30,728.28-42,385.32-21,295.02

Finding the Fourth Proportional to 30,728.28, 42,385.32 and 21,295.02

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Solution

The fourth proportional to 30,728.28, 42,385.32 and 21,295.02 is: 29,373.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,728.28 : 42,385.32 = 21,295.02 : x
  2. Step 2: Convert to fraction form
    30,728.28/42,385.32 = 21,295.02/x
  3. Step 3: Cross multiply
    30,728.28x = 42,385.32 × 21,295.02
  4. Step 4: Simplify right side
    30,728.28x = 902,596,237.11
  5. Step 5: Solve for x
    x = 902,596,237.11/30,728.28
  6. Step 6: Final answer
    x = 29,373.47

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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.