Home / 85,379.16-128,637.93-77,068.56

Finding the Fourth Proportional to 85,379.16, 128,637.93 and 77,068.56

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Solution

The fourth proportional to 85,379.16, 128,637.93 and 77,068.56 is: 116,116.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,379.16 : 128,637.93 = 77,068.56 : x
  2. Step 2: Convert to fraction form
    85,379.16/128,637.93 = 77,068.56/x
  3. Step 3: Cross multiply
    85,379.16x = 128,637.93 × 77,068.56
  4. Step 4: Simplify right side
    85,379.16x = 9,913,940,026.48
  5. Step 5: Solve for x
    x = 9,913,940,026.48/85,379.16
  6. Step 6: Final answer
    x = 116,116.63

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.