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Finding the Fourth Proportional to 638,866.61, 881,636.66 and 366,987.15

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Solution

The fourth proportional to 638,866.61, 881,636.66 and 366,987.15 is: 506,442.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,866.61 : 881,636.66 = 366,987.15 : x
  2. Step 2: Convert to fraction form
    638,866.61/881,636.66 = 366,987.15/x
  3. Step 3: Cross multiply
    638,866.61x = 881,636.66 × 366,987.15
  4. Step 4: Simplify right side
    638,866.61x = 323,549,323,353.98
  5. Step 5: Solve for x
    x = 323,549,323,353.98/638,866.61
  6. Step 6: Final answer
    x = 506,442.69

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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.