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Finding the Fourth Proportional to 78,112.31, 107,823.29 and 51,263.51

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Solution

The fourth proportional to 78,112.31, 107,823.29 and 51,263.51 is: 70,762.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,112.31 : 107,823.29 = 51,263.51 : x
  2. Step 2: Convert to fraction form
    78,112.31/107,823.29 = 51,263.51/x
  3. Step 3: Cross multiply
    78,112.31x = 107,823.29 × 51,263.51
  4. Step 4: Simplify right side
    78,112.31x = 5,527,399,509.71
  5. Step 5: Solve for x
    x = 5,527,399,509.71/78,112.31
  6. Step 6: Final answer
    x = 70,762.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.