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Finding the Fourth Proportional to 857.00, 1,287.90 and 510.39

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Solution

The fourth proportional to 857.00, 1,287.90 and 510.39 is: 767.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.00 : 1,287.90 = 510.39 : x
  2. Step 2: Convert to fraction form
    857.00/1,287.90 = 510.39/x
  3. Step 3: Cross multiply
    857.00x = 1,287.90 × 510.39
  4. Step 4: Simplify right side
    857.00x = 657,331.28
  5. Step 5: Solve for x
    x = 657,331.28/857.00
  6. Step 6: Final answer
    x = 767.01

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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.