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Finding the Fourth Proportional to 649,813.77, 974,720.66 and 428,145.93

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Solution

The fourth proportional to 649,813.77, 974,720.66 and 428,145.93 is: 642,218.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    649,813.77 : 974,720.66 = 428,145.93 : x
  2. Step 2: Convert to fraction form
    649,813.77/974,720.66 = 428,145.93/x
  3. Step 3: Cross multiply
    649,813.77x = 974,720.66 × 428,145.93
  4. Step 4: Simplify right side
    649,813.77x = 417,322,681,325.18
  5. Step 5: Solve for x
    x = 417,322,681,325.18/649,813.77
  6. Step 6: Final answer
    x = 642,218.90

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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.