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Finding the Fourth Proportional to 879,939, 1,214,330.40 and 477,531

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Solution

The fourth proportional to 879,939, 1,214,330.40 and 477,531 is: 659,000.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,939 : 1,214,330.40 = 477,531 : x
  2. Step 2: Convert to fraction form
    879,939/1,214,330.40 = 477,531/x
  3. Step 3: Cross multiply
    879,939x = 1,214,330.40 × 477,531
  4. Step 4: Simplify right side
    879,939x = 579,880,410,242.40
  5. Step 5: Solve for x
    x = 579,880,410,242.40/879,939
  6. Step 6: Final answer
    x = 659,000.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.