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Finding the Fourth Proportional to 878,809.20, 1,318,213.80 and 406,417.20

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Solution

The fourth proportional to 878,809.20, 1,318,213.80 and 406,417.20 is: 609,625.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,809.20 : 1,318,213.80 = 406,417.20 : x
  2. Step 2: Convert to fraction form
    878,809.20/1,318,213.80 = 406,417.20/x
  3. Step 3: Cross multiply
    878,809.20x = 1,318,213.80 × 406,417.20
  4. Step 4: Simplify right side
    878,809.20x = 535,744,761,597.36
  5. Step 5: Solve for x
    x = 535,744,761,597.36/878,809.20
  6. Step 6: Final answer
    x = 609,625.80

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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.