Home / 42,909.65-64,280.68-20,388.28

Finding the Fourth Proportional to 42,909.65, 64,280.68 and 20,388.28

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Solution

The fourth proportional to 42,909.65, 64,280.68 and 20,388.28 is: 30,542.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,909.65 : 64,280.68 = 20,388.28 : x
  2. Step 2: Convert to fraction form
    42,909.65/64,280.68 = 20,388.28/x
  3. Step 3: Cross multiply
    42,909.65x = 64,280.68 × 20,388.28
  4. Step 4: Simplify right side
    42,909.65x = 1,310,572,341.73
  5. Step 5: Solve for x
    x = 1,310,572,341.73/42,909.65
  6. Step 6: Final answer
    x = 30,542.60

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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.