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Finding the Fourth Proportional to 578,411.20, 865,867.20 and 515,425.60

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Solution

The fourth proportional to 578,411.20, 865,867.20 and 515,425.60 is: 771,579.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,411.20 : 865,867.20 = 515,425.60 : x
  2. Step 2: Convert to fraction form
    578,411.20/865,867.20 = 515,425.60/x
  3. Step 3: Cross multiply
    578,411.20x = 865,867.20 × 515,425.60
  4. Step 4: Simplify right side
    578,411.20x = 446,290,121,080.32
  5. Step 5: Solve for x
    x = 446,290,121,080.32/578,411.20
  6. Step 6: Final answer
    x = 771,579.32

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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.