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Finding the Fourth Proportional to 665,482.56, 918,809.38 and 393,637.80

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Solution

The fourth proportional to 665,482.56, 918,809.38 and 393,637.80 is: 543,482.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,482.56 : 918,809.38 = 393,637.80 : x
  2. Step 2: Convert to fraction form
    665,482.56/918,809.38 = 393,637.80/x
  3. Step 3: Cross multiply
    665,482.56x = 918,809.38 × 393,637.80
  4. Step 4: Simplify right side
    665,482.56x = 361,678,102,962.56
  5. Step 5: Solve for x
    x = 361,678,102,962.56/665,482.56
  6. Step 6: Final answer
    x = 543,482.47

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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.