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Finding the Fourth Proportional to 42,809.60, 64,219.20 and 13,227.20

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Solution

The fourth proportional to 42,809.60, 64,219.20 and 13,227.20 is: 19,842.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,809.60 : 64,219.20 = 13,227.20 : x
  2. Step 2: Convert to fraction form
    42,809.60/64,219.20 = 13,227.20/x
  3. Step 3: Cross multiply
    42,809.60x = 64,219.20 × 13,227.20
  4. Step 4: Simplify right side
    42,809.60x = 849,440,202.24
  5. Step 5: Solve for x
    x = 849,440,202.24/42,809.60
  6. Step 6: Final answer
    x = 19,842.28

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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.