Home / 30,511.02-42,124.79-20,947.83

Finding the Fourth Proportional to 30,511.02, 42,124.79 and 20,947.83

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Solution

The fourth proportional to 30,511.02, 42,124.79 and 20,947.83 is: 28,921.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,511.02 : 42,124.79 = 20,947.83 : x
  2. Step 2: Convert to fraction form
    30,511.02/42,124.79 = 20,947.83/x
  3. Step 3: Cross multiply
    30,511.02x = 42,124.79 × 20,947.83
  4. Step 4: Simplify right side
    30,511.02x = 882,422,939.71
  5. Step 5: Solve for x
    x = 882,422,939.71/30,511.02
  6. Step 6: Final answer
    x = 28,921.45

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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.