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Finding the Fourth Proportional to 605,145.40, 909,686.40 and 428,873.20

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Solution

The fourth proportional to 605,145.40, 909,686.40 and 428,873.20 is: 644,704.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    605,145.40 : 909,686.40 = 428,873.20 : x
  2. Step 2: Convert to fraction form
    605,145.40/909,686.40 = 428,873.20/x
  3. Step 3: Cross multiply
    605,145.40x = 909,686.40 × 428,873.20
  4. Step 4: Simplify right side
    605,145.40x = 390,140,117,364.48
  5. Step 5: Solve for x
    x = 390,140,117,364.48/605,145.40
  6. Step 6: Final answer
    x = 644,704.76

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.