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Finding the Fourth Proportional to 211,279.50, 291,565.80 and 121,855.50

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Solution

The fourth proportional to 211,279.50, 291,565.80 and 121,855.50 is: 168,160.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,279.50 : 291,565.80 = 121,855.50 : x
  2. Step 2: Convert to fraction form
    211,279.50/291,565.80 = 121,855.50/x
  3. Step 3: Cross multiply
    211,279.50x = 291,565.80 × 121,855.50
  4. Step 4: Simplify right side
    211,279.50x = 35,528,896,341.90
  5. Step 5: Solve for x
    x = 35,528,896,341.90/211,279.50
  6. Step 6: Final answer
    x = 168,160.64

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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.