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Finding the Fourth Proportional to 221,905, 306,228.90 and 121,303.72

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Solution

The fourth proportional to 221,905, 306,228.90 and 121,303.72 is: 167,399.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,905 : 306,228.90 = 121,303.72 : x
  2. Step 2: Convert to fraction form
    221,905/306,228.90 = 121,303.72/x
  3. Step 3: Cross multiply
    221,905x = 306,228.90 × 121,303.72
  4. Step 4: Simplify right side
    221,905x = 37,146,704,741.51
  5. Step 5: Solve for x
    x = 37,146,704,741.51/221,905
  6. Step 6: Final answer
    x = 167,399.13

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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.