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Finding the Fourth Proportional to 420,430.14, 630,270.20 and 154,128.48

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Solution

The fourth proportional to 420,430.14, 630,270.20 and 154,128.48 is: 231,055.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,430.14 : 630,270.20 = 154,128.48 : x
  2. Step 2: Convert to fraction form
    420,430.14/630,270.20 = 154,128.48/x
  3. Step 3: Cross multiply
    420,430.14x = 630,270.20 × 154,128.48
  4. Step 4: Simplify right side
    420,430.14x = 97,142,587,915.30
  5. Step 5: Solve for x
    x = 97,142,587,915.30/420,430.14
  6. Step 6: Final answer
    x = 231,055.24

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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.