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Finding the Fourth Proportional to 879,990, 1,214,386.20 and 477,582

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Solution

The fourth proportional to 879,990, 1,214,386.20 and 477,582 is: 659,063.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,990 : 1,214,386.20 = 477,582 : x
  2. Step 2: Convert to fraction form
    879,990/1,214,386.20 = 477,582/x
  3. Step 3: Cross multiply
    879,990x = 1,214,386.20 × 477,582
  4. Step 4: Simplify right side
    879,990x = 579,968,990,168.40
  5. Step 5: Solve for x
    x = 579,968,990,168.40/879,990
  6. Step 6: Final answer
    x = 659,063.16

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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.