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Finding the Fourth Proportional to 85,791.16, 128,688.60 and 60,386.86

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Solution

The fourth proportional to 85,791.16, 128,688.60 and 60,386.86 is: 90,581.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,791.16 : 128,688.60 = 60,386.86 : x
  2. Step 2: Convert to fraction form
    85,791.16/128,688.60 = 60,386.86/x
  3. Step 3: Cross multiply
    85,791.16x = 128,688.60 × 60,386.86
  4. Step 4: Simplify right side
    85,791.16x = 7,771,099,828.35
  5. Step 5: Solve for x
    x = 7,771,099,828.35/85,791.16
  6. Step 6: Final answer
    x = 90,581.60

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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.