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Finding the Fourth Proportional to 85,302.72, 128,011.20 and 29,898.72

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Solution

The fourth proportional to 85,302.72, 128,011.20 and 29,898.72 is: 44,868.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,302.72 : 128,011.20 = 29,898.72 : x
  2. Step 2: Convert to fraction form
    85,302.72/128,011.20 = 29,898.72/x
  3. Step 3: Cross multiply
    85,302.72x = 128,011.20 × 29,898.72
  4. Step 4: Simplify right side
    85,302.72x = 3,827,371,025.66
  5. Step 5: Solve for x
    x = 3,827,371,025.66/85,302.72
  6. Step 6: Final answer
    x = 44,868.10

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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.