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Finding the Fourth Proportional to 860.70, 1,187.40 and 529.02

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Solution

The fourth proportional to 860.70, 1,187.40 and 529.02 is: 729.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.70 : 1,187.40 = 529.02 : x
  2. Step 2: Convert to fraction form
    860.70/1,187.40 = 529.02/x
  3. Step 3: Cross multiply
    860.70x = 1,187.40 × 529.02
  4. Step 4: Simplify right side
    860.70x = 628,158.35
  5. Step 5: Solve for x
    x = 628,158.35/860.70
  6. Step 6: Final answer
    x = 729.82

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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.