Home / 30,423.20-42,041.76-21,953.12

Finding the Fourth Proportional to 30,423.20, 42,041.76 and 21,953.12

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Solution

The fourth proportional to 30,423.20, 42,041.76 and 21,953.12 is: 30,336.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,423.20 : 42,041.76 = 21,953.12 : x
  2. Step 2: Convert to fraction form
    30,423.20/42,041.76 = 21,953.12/x
  3. Step 3: Cross multiply
    30,423.20x = 42,041.76 × 21,953.12
  4. Step 4: Simplify right side
    30,423.20x = 922,947,802.29
  5. Step 5: Solve for x
    x = 922,947,802.29/30,423.20
  6. Step 6: Final answer
    x = 30,336.97

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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.