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Finding the Fourth Proportional to 862.09, 1,189.58 and 508.10

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Solution

The fourth proportional to 862.09, 1,189.58 and 508.10 is: 701.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.09 : 1,189.58 = 508.10 : x
  2. Step 2: Convert to fraction form
    862.09/1,189.58 = 508.10/x
  3. Step 3: Cross multiply
    862.09x = 1,189.58 × 508.10
  4. Step 4: Simplify right side
    862.09x = 604,417.11
  5. Step 5: Solve for x
    x = 604,417.11/862.09
  6. Step 6: Final answer
    x = 701.11

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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.