Home / 103,205.07-142,428.75-77,665.50

Finding the Fourth Proportional to 103,205.07, 142,428.75 and 77,665.50

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Solution

The fourth proportional to 103,205.07, 142,428.75 and 77,665.50 is: 107,182.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,205.07 : 142,428.75 = 77,665.50 : x
  2. Step 2: Convert to fraction form
    103,205.07/142,428.75 = 77,665.50/x
  3. Step 3: Cross multiply
    103,205.07x = 142,428.75 × 77,665.50
  4. Step 4: Simplify right side
    103,205.07x = 11,061,800,083.13
  5. Step 5: Solve for x
    x = 11,061,800,083.13/103,205.07
  6. Step 6: Final answer
    x = 107,182.72

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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.