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Finding the Fourth Proportional to 30,959.65, 42,721.95 and 18,213.34

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Solution

The fourth proportional to 30,959.65, 42,721.95 and 18,213.34 is: 25,133.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,959.65 : 42,721.95 = 18,213.34 : x
  2. Step 2: Convert to fraction form
    30,959.65/42,721.95 = 18,213.34/x
  3. Step 3: Cross multiply
    30,959.65x = 42,721.95 × 18,213.34
  4. Step 4: Simplify right side
    30,959.65x = 778,109,400.81
  5. Step 5: Solve for x
    x = 778,109,400.81/30,959.65
  6. Step 6: Final answer
    x = 25,133.02

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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.