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Finding the Fourth Proportional to 643,902.80, 965,854.20 and 478,014.80

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Solution

The fourth proportional to 643,902.80, 965,854.20 and 478,014.80 is: 717,022.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,902.80 : 965,854.20 = 478,014.80 : x
  2. Step 2: Convert to fraction form
    643,902.80/965,854.20 = 478,014.80/x
  3. Step 3: Cross multiply
    643,902.80x = 965,854.20 × 478,014.80
  4. Step 4: Simplify right side
    643,902.80x = 461,692,602,242.16
  5. Step 5: Solve for x
    x = 461,692,602,242.16/643,902.80
  6. Step 6: Final answer
    x = 717,022.20

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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.