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Finding the Fourth Proportional to 399,780.55, 551,643.87 and 256,734.37

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Solution

The fourth proportional to 399,780.55, 551,643.87 and 256,734.37 is: 354,259.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,780.55 : 551,643.87 = 256,734.37 : x
  2. Step 2: Convert to fraction form
    399,780.55/551,643.87 = 256,734.37/x
  3. Step 3: Cross multiply
    399,780.55x = 551,643.87 × 256,734.37
  4. Step 4: Simplify right side
    399,780.55x = 141,625,941,428.81
  5. Step 5: Solve for x
    x = 141,625,941,428.81/399,780.55
  6. Step 6: Final answer
    x = 354,259.21

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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.