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Finding the Fourth Proportional to 77,071.68, 115,420.65 and 53,312.56

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Solution

The fourth proportional to 77,071.68, 115,420.65 and 53,312.56 is: 79,839.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,071.68 : 115,420.65 = 53,312.56 : x
  2. Step 2: Convert to fraction form
    77,071.68/115,420.65 = 53,312.56/x
  3. Step 3: Cross multiply
    77,071.68x = 115,420.65 × 53,312.56
  4. Step 4: Simplify right side
    77,071.68x = 6,153,370,328.36
  5. Step 5: Solve for x
    x = 6,153,370,328.36/77,071.68
  6. Step 6: Final answer
    x = 79,839.58

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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.