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Finding the Fourth Proportional to 121,209.70, 181,814.55 and 85,780.30

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Solution

The fourth proportional to 121,209.70, 181,814.55 and 85,780.30 is: 128,670.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,209.70 : 181,814.55 = 85,780.30 : x
  2. Step 2: Convert to fraction form
    121,209.70/181,814.55 = 85,780.30/x
  3. Step 3: Cross multiply
    121,209.70x = 181,814.55 × 85,780.30
  4. Step 4: Simplify right side
    121,209.70x = 15,596,106,643.37
  5. Step 5: Solve for x
    x = 15,596,106,643.37/121,209.70
  6. Step 6: Final answer
    x = 128,670.45

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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.