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Finding the Fourth Proportional to 860.21, 1,187.08 and 510.89

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Solution

The fourth proportional to 860.21, 1,187.08 and 510.89 is: 705.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.21 : 1,187.08 = 510.89 : x
  2. Step 2: Convert to fraction form
    860.21/1,187.08 = 510.89/x
  3. Step 3: Cross multiply
    860.21x = 1,187.08 × 510.89
  4. Step 4: Simplify right side
    860.21x = 606,467.30
  5. Step 5: Solve for x
    x = 606,467.30/860.21
  6. Step 6: Final answer
    x = 705.02

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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.