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Finding the Fourth Proportional to 318,886, 478,350.87 and 105,653.50

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Solution

The fourth proportional to 318,886, 478,350.87 and 105,653.50 is: 158,487.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,886 : 478,350.87 = 105,653.50 : x
  2. Step 2: Convert to fraction form
    318,886/478,350.87 = 105,653.50/x
  3. Step 3: Cross multiply
    318,886x = 478,350.87 × 105,653.50
  4. Step 4: Simplify right side
    318,886x = 50,539,443,643.55
  5. Step 5: Solve for x
    x = 50,539,443,643.55/318,886
  6. Step 6: Final answer
    x = 158,487.50

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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.