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Finding the Fourth Proportional to 121,278.45, 181,917.68 and 42,384.45

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Solution

The fourth proportional to 121,278.45, 181,917.68 and 42,384.45 is: 63,576.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,278.45 : 181,917.68 = 42,384.45 : x
  2. Step 2: Convert to fraction form
    121,278.45/181,917.68 = 42,384.45/x
  3. Step 3: Cross multiply
    121,278.45x = 181,917.68 × 42,384.45
  4. Step 4: Simplify right side
    121,278.45x = 7,710,480,600.15
  5. Step 5: Solve for x
    x = 7,710,480,600.15/121,278.45
  6. Step 6: Final answer
    x = 63,576.68

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1.5x scale

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.