Home / 42,787.68-64,128-20,595.12

Finding the Fourth Proportional to 42,787.68, 64,128 and 20,595.12

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Solution

The fourth proportional to 42,787.68, 64,128 and 20,595.12 is: 30,866.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,787.68 : 64,128 = 20,595.12 : x
  2. Step 2: Convert to fraction form
    42,787.68/64,128 = 20,595.12/x
  3. Step 3: Cross multiply
    42,787.68x = 64,128 × 20,595.12
  4. Step 4: Simplify right side
    42,787.68x = 1,320,723,855.36
  5. Step 5: Solve for x
    x = 1,320,723,855.36/42,787.68
  6. Step 6: Final answer
    x = 30,866.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.