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Finding the Fourth Proportional to 77,128.90, 115,693.35 and 59,632.90

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Solution

The fourth proportional to 77,128.90, 115,693.35 and 59,632.90 is: 89,449.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,128.90 : 115,693.35 = 59,632.90 : x
  2. Step 2: Convert to fraction form
    77,128.90/115,693.35 = 59,632.90/x
  3. Step 3: Cross multiply
    77,128.90x = 115,693.35 × 59,632.90
  4. Step 4: Simplify right side
    77,128.90x = 6,899,129,971.22
  5. Step 5: Solve for x
    x = 6,899,129,971.22/77,128.90
  6. Step 6: Final answer
    x = 89,449.35

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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.