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Finding the Fourth Proportional to 718,459.58, 991,437.84 and 408,354.03

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Solution

The fourth proportional to 718,459.58, 991,437.84 and 408,354.03 is: 563,507.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,459.58 : 991,437.84 = 408,354.03 : x
  2. Step 2: Convert to fraction form
    718,459.58/991,437.84 = 408,354.03/x
  3. Step 3: Cross multiply
    718,459.58x = 991,437.84 × 408,354.03
  4. Step 4: Simplify right side
    718,459.58x = 404,857,637,458.50
  5. Step 5: Solve for x
    x = 404,857,637,458.50/718,459.58
  6. Step 6: Final answer
    x = 563,507.89

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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.