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Finding the Fourth Proportional to 145,415.80, 217,961.70 and 56,639.80

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Solution

The fourth proportional to 145,415.80, 217,961.70 and 56,639.80 is: 84,896.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,415.80 : 217,961.70 = 56,639.80 : x
  2. Step 2: Convert to fraction form
    145,415.80/217,961.70 = 56,639.80/x
  3. Step 3: Cross multiply
    145,415.80x = 217,961.70 × 56,639.80
  4. Step 4: Simplify right side
    145,415.80x = 12,345,307,095.66
  5. Step 5: Solve for x
    x = 12,345,307,095.66/145,415.80
  6. Step 6: Final answer
    x = 84,896.60

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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.