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Finding the Fourth Proportional to 526,718.40, 789,040.80 and 315,729.60

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Solution

The fourth proportional to 526,718.40, 789,040.80 and 315,729.60 is: 472,972.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    526,718.40 : 789,040.80 = 315,729.60 : x
  2. Step 2: Convert to fraction form
    526,718.40/789,040.80 = 315,729.60/x
  3. Step 3: Cross multiply
    526,718.40x = 789,040.80 × 315,729.60
  4. Step 4: Simplify right side
    526,718.40x = 249,123,536,167.68
  5. Step 5: Solve for x
    x = 249,123,536,167.68/526,718.40
  6. Step 6: Final answer
    x = 472,972.91

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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.