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Finding the Fourth Proportional to 287,980.72, 431,941.91 and 77,639.92

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Solution

The fourth proportional to 287,980.72, 431,941.91 and 77,639.92 is: 116,452.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,980.72 : 431,941.91 = 77,639.92 : x
  2. Step 2: Convert to fraction form
    287,980.72/431,941.91 = 77,639.92/x
  3. Step 3: Cross multiply
    287,980.72x = 431,941.91 × 77,639.92
  4. Step 4: Simplify right side
    287,980.72x = 33,535,935,337.05
  5. Step 5: Solve for x
    x = 33,535,935,337.05/287,980.72
  6. Step 6: Final answer
    x = 116,452.02

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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.