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Finding the Fourth Proportional to 1,070.87, 1,601.68 and 631.08

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Solution

The fourth proportional to 1,070.87, 1,601.68 and 631.08 is: 943.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.87 : 1,601.68 = 631.08 : x
  2. Step 2: Convert to fraction form
    1,070.87/1,601.68 = 631.08/x
  3. Step 3: Cross multiply
    1,070.87x = 1,601.68 × 631.08
  4. Step 4: Simplify right side
    1,070.87x = 1,010,788.21
  5. Step 5: Solve for x
    x = 1,010,788.21/1,070.87
  6. Step 6: Final answer
    x = 943.89

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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.