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Finding the Fourth Proportional to 101,699.76, 140,340.60 and 56,979.12

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Solution

The fourth proportional to 101,699.76, 140,340.60 and 56,979.12 is: 78,628.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,699.76 : 140,340.60 = 56,979.12 : x
  2. Step 2: Convert to fraction form
    101,699.76/140,340.60 = 56,979.12/x
  3. Step 3: Cross multiply
    101,699.76x = 140,340.60 × 56,979.12
  4. Step 4: Simplify right side
    101,699.76x = 7,996,483,888.27
  5. Step 5: Solve for x
    x = 7,996,483,888.27/101,699.76
  6. Step 6: Final answer
    x = 78,628.35

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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.