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Finding the Fourth Proportional to 85,951.48, 128,802.60 and 61,040.32

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Solution

The fourth proportional to 85,951.48, 128,802.60 and 61,040.32 is: 91,471.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,951.48 : 128,802.60 = 61,040.32 : x
  2. Step 2: Convert to fraction form
    85,951.48/128,802.60 = 61,040.32/x
  3. Step 3: Cross multiply
    85,951.48x = 128,802.60 × 61,040.32
  4. Step 4: Simplify right side
    85,951.48x = 7,862,151,920.83
  5. Step 5: Solve for x
    x = 7,862,151,920.83/85,951.48
  6. Step 6: Final answer
    x = 91,471.98

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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.