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Finding the Fourth Proportional to 857.48, 1,286.05 and 530.63

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Solution

The fourth proportional to 857.48, 1,286.05 and 530.63 is: 795.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.48 : 1,286.05 = 530.63 : x
  2. Step 2: Convert to fraction form
    857.48/1,286.05 = 530.63/x
  3. Step 3: Cross multiply
    857.48x = 1,286.05 × 530.63
  4. Step 4: Simplify right side
    857.48x = 682,416.26
  5. Step 5: Solve for x
    x = 682,416.26/857.48
  6. Step 6: Final answer
    x = 795.84

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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.