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Finding the Fourth Proportional to 287,334.65, 430,985.91 and 87,639.35

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Solution

The fourth proportional to 287,334.65, 430,985.91 and 87,639.35 is: 131,454.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,334.65 : 430,985.91 = 87,639.35 : x
  2. Step 2: Convert to fraction form
    287,334.65/430,985.91 = 87,639.35/x
  3. Step 3: Cross multiply
    287,334.65x = 430,985.91 × 87,639.35
  4. Step 4: Simplify right side
    287,334.65x = 37,771,323,185.28
  5. Step 5: Solve for x
    x = 37,771,323,185.28/287,334.65
  6. Step 6: Final answer
    x = 131,454.12

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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.