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Finding the Fourth Proportional to 421,520.90, 631,985.70 and 155,246.90

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Solution

The fourth proportional to 421,520.90, 631,985.70 and 155,246.90 is: 232,761.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,520.90 : 631,985.70 = 155,246.90 : x
  2. Step 2: Convert to fraction form
    421,520.90/631,985.70 = 155,246.90/x
  3. Step 3: Cross multiply
    421,520.90x = 631,985.70 × 155,246.90
  4. Step 4: Simplify right side
    421,520.90x = 98,113,820,769.33
  5. Step 5: Solve for x
    x = 98,113,820,769.33/421,520.90
  6. Step 6: Final answer
    x = 232,761.46

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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.