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Finding the Fourth Proportional to 210,534.80, 315,802.20 and 121,742.60

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Solution

The fourth proportional to 210,534.80, 315,802.20 and 121,742.60 is: 182,613.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,534.80 : 315,802.20 = 121,742.60 : x
  2. Step 2: Convert to fraction form
    210,534.80/315,802.20 = 121,742.60/x
  3. Step 3: Cross multiply
    210,534.80x = 315,802.20 × 121,742.60
  4. Step 4: Simplify right side
    210,534.80x = 38,446,580,913.72
  5. Step 5: Solve for x
    x = 38,446,580,913.72/210,534.80
  6. Step 6: Final answer
    x = 182,613.90

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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.