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Finding the Fourth Proportional to 100,895.50, 139,235.79 and 58,478.64

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Solution

The fourth proportional to 100,895.50, 139,235.79 and 58,478.64 is: 80,700.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,895.50 : 139,235.79 = 58,478.64 : x
  2. Step 2: Convert to fraction form
    100,895.50/139,235.79 = 58,478.64/x
  3. Step 3: Cross multiply
    100,895.50x = 139,235.79 × 58,478.64
  4. Step 4: Simplify right side
    100,895.50x = 8,142,319,638.53
  5. Step 5: Solve for x
    x = 8,142,319,638.53/100,895.50
  6. Step 6: Final answer
    x = 80,700.52

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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.