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Finding the Fourth Proportional to 347,128, 478,899.72 and 217,990.52

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Solution

The fourth proportional to 347,128, 478,899.72 and 217,990.52 is: 300,740.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    347,128 : 478,899.72 = 217,990.52 : x
  2. Step 2: Convert to fraction form
    347,128/478,899.72 = 217,990.52/x
  3. Step 3: Cross multiply
    347,128x = 478,899.72 × 217,990.52
  4. Step 4: Simplify right side
    347,128x = 104,395,598,990.65
  5. Step 5: Solve for x
    x = 104,395,598,990.65/347,128
  6. Step 6: Final answer
    x = 300,740.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.