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Finding the Fourth Proportional to 421,410.90, 631,821.04 and 155,136.76

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Solution

The fourth proportional to 421,410.90, 631,821.04 and 155,136.76 is: 232,596.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,410.90 : 631,821.04 = 155,136.76 : x
  2. Step 2: Convert to fraction form
    421,410.90/631,821.04 = 155,136.76/x
  3. Step 3: Cross multiply
    421,410.90x = 631,821.04 × 155,136.76
  4. Step 4: Simplify right side
    421,410.90x = 98,018,669,045.43
  5. Step 5: Solve for x
    x = 98,018,669,045.43/421,410.90
  6. Step 6: Final answer
    x = 232,596.43

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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.