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Finding the Fourth Proportional to 871,393.60, 1,307,128.80 and 492,308.80

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Solution

The fourth proportional to 871,393.60, 1,307,128.80 and 492,308.80 is: 738,484.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    871,393.60 : 1,307,128.80 = 492,308.80 : x
  2. Step 2: Convert to fraction form
    871,393.60/1,307,128.80 = 492,308.80/x
  3. Step 3: Cross multiply
    871,393.60x = 1,307,128.80 × 492,308.80
  4. Step 4: Simplify right side
    871,393.60x = 643,511,010,973.44
  5. Step 5: Solve for x
    x = 643,511,010,973.44/871,393.60
  6. Step 6: Final answer
    x = 738,484.89

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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.