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Finding the Fourth Proportional to 420,430.53, 630,270.73 and 154,128.86

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Solution

The fourth proportional to 420,430.53, 630,270.73 and 154,128.86 is: 231,055.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,430.53 : 630,270.73 = 154,128.86 : x
  2. Step 2: Convert to fraction form
    420,430.53/630,270.73 = 154,128.86/x
  3. Step 3: Cross multiply
    420,430.53x = 630,270.73 × 154,128.86
  4. Step 4: Simplify right side
    420,430.53x = 97,142,909,106.27
  5. Step 5: Solve for x
    x = 97,142,909,106.27/420,430.53
  6. Step 6: Final answer
    x = 231,055.79

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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.