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Finding the Fourth Proportional to 707,700.80, 976,707.78 and 421,221.80

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Solution

The fourth proportional to 707,700.80, 976,707.78 and 421,221.80 is: 581,334.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    707,700.80 : 976,707.78 = 421,221.80 : x
  2. Step 2: Convert to fraction form
    707,700.80/976,707.78 = 421,221.80/x
  3. Step 3: Cross multiply
    707,700.80x = 976,707.78 × 421,221.80
  4. Step 4: Simplify right side
    707,700.80x = 411,410,609,165.60
  5. Step 5: Solve for x
    x = 411,410,609,165.60/707,700.80
  6. Step 6: Final answer
    x = 581,334.10

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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.