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Finding the Fourth Proportional to 287,379.15, 431,068.73 and 87,700.56

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Solution

The fourth proportional to 287,379.15, 431,068.73 and 87,700.56 is: 131,550.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,379.15 : 431,068.73 = 87,700.56 : x
  2. Step 2: Convert to fraction form
    287,379.15/431,068.73 = 87,700.56/x
  3. Step 3: Cross multiply
    287,379.15x = 431,068.73 × 87,700.56
  4. Step 4: Simplify right side
    287,379.15x = 37,804,968,580.99
  5. Step 5: Solve for x
    x = 37,804,968,580.99/287,379.15
  6. Step 6: Final answer
    x = 131,550.84

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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.