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Finding the Fourth Proportional to 528,115.11, 728,799.21 and 286,397.61

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Solution

The fourth proportional to 528,115.11, 728,799.21 and 286,397.61 is: 395,228.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,115.11 : 728,799.21 = 286,397.61 : x
  2. Step 2: Convert to fraction form
    528,115.11/728,799.21 = 286,397.61/x
  3. Step 3: Cross multiply
    528,115.11x = 728,799.21 × 286,397.61
  4. Step 4: Simplify right side
    528,115.11x = 208,726,351,913.89
  5. Step 5: Solve for x
    x = 208,726,351,913.89/528,115.11
  6. Step 6: Final answer
    x = 395,228.90

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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.