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Finding the Fourth Proportional to 42,807.40, 64,209.90 and 19,433.80

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Solution

The fourth proportional to 42,807.40, 64,209.90 and 19,433.80 is: 29,150.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,807.40 : 64,209.90 = 19,433.80 : x
  2. Step 2: Convert to fraction form
    42,807.40/64,209.90 = 19,433.80/x
  3. Step 3: Cross multiply
    42,807.40x = 64,209.90 × 19,433.80
  4. Step 4: Simplify right side
    42,807.40x = 1,247,842,354.62
  5. Step 5: Solve for x
    x = 1,247,842,354.62/42,807.40
  6. Step 6: Final answer
    x = 29,150.16

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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.