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Finding the Fourth Proportional to 858.02, 1,287.05 and 371.43

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Solution

The fourth proportional to 858.02, 1,287.05 and 371.43 is: 557.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.02 : 1,287.05 = 371.43 : x
  2. Step 2: Convert to fraction form
    858.02/1,287.05 = 371.43/x
  3. Step 3: Cross multiply
    858.02x = 1,287.05 × 371.43
  4. Step 4: Simplify right side
    858.02x = 478,047.12
  5. Step 5: Solve for x
    x = 478,047.12/858.02
  6. Step 6: Final answer
    x = 557.15

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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.