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Finding the Fourth Proportional to 421,215.40, 631,995.90 and 155,103.40

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Solution

The fourth proportional to 421,215.40, 631,995.90 and 155,103.40 is: 232,718.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,215.40 : 631,995.90 = 155,103.40 : x
  2. Step 2: Convert to fraction form
    421,215.40/631,995.90 = 155,103.40/x
  3. Step 3: Cross multiply
    421,215.40x = 631,995.90 × 155,103.40
  4. Step 4: Simplify right side
    421,215.40x = 98,024,712,876.06
  5. Step 5: Solve for x
    x = 98,024,712,876.06/421,215.40
  6. Step 6: Final answer
    x = 232,718.73

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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.