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Finding the Fourth Proportional to 287,064.61, 430,659.18 and 87,379.80

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Solution

The fourth proportional to 287,064.61, 430,659.18 and 87,379.80 is: 131,088.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,064.61 : 430,659.18 = 87,379.80 : x
  2. Step 2: Convert to fraction form
    287,064.61/430,659.18 = 87,379.80/x
  3. Step 3: Cross multiply
    287,064.61x = 430,659.18 × 87,379.80
  4. Step 4: Simplify right side
    287,064.61x = 37,630,913,218.44
  5. Step 5: Solve for x
    x = 37,630,913,218.44/287,064.61
  6. Step 6: Final answer
    x = 131,088.65

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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.