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Finding the Fourth Proportional to 664,656.80, 996,985.20 and 428,266.40

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Solution

The fourth proportional to 664,656.80, 996,985.20 and 428,266.40 is: 642,399.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,656.80 : 996,985.20 = 428,266.40 : x
  2. Step 2: Convert to fraction form
    664,656.80/996,985.20 = 428,266.40/x
  3. Step 3: Cross multiply
    664,656.80x = 996,985.20 × 428,266.40
  4. Step 4: Simplify right side
    664,656.80x = 426,975,262,457.28
  5. Step 5: Solve for x
    x = 426,975,262,457.28/664,656.80
  6. Step 6: Final answer
    x = 642,399.60

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Similar ratio
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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.